How to Use a Surface Cleaner
A surface cleaner is the easiest pressure washer attachment to own and the easiest to use badly. Speed, overlap and the rinse are where the finish is won or lost.
Alex Rivers
Home Improvement Editor
Last Updated
October 18, 2026
In This Guide
A surface cleaner does not clean concrete by force. It cleans by sweeping the same strip many times from several angles, and that only works if the bar spins at the speed it was designed for and you move the deck slowly enough to let it. Get the match, the pace and the rinse right and a driveway comes out an even colour from edge to edge. Get any of them wrong and you trade wand stripes for semicircles.
1. Match the Surface Cleaner to Your Pressure Washer
Before the first pass, confirm the attachment and the washer belong together. A surface cleaner's spray bar is driven by the water leaving its nozzles, so the bar only reaches its intended speed when the washer supplies the flow the deck was built for. A large quad-nozzle deck on a small electric washer spins lazily and cleans in bands; a small deck on a big gas washer can be overpowered and wear its swivel early. Our surface cleaner rankings list which washer class each attachment suits.
The useful numbers are on your washer's label: rated PSI and rated GPM. As a rough guide, 12 to 14 inch decks suit roughly 1,500 to 2,000 PSI and 1.5 to 2.0 GPM, 15 to 16 inch decks suit about 2,800 to 3,400 PSI and 2.3 to 3.0 GPM, and 18 to 20 inch decks want gas washers of 3,200 PSI or more and 3.0 to 4.0 GPM and up. Our surface cleaner sizing guide walks through the maths if you sit between classes.
Check the inlet fitting next. Most aftermarket decks use a 1/4-inch quick-connect plug that snaps into a standard gun or wand coupler, while some brand-specific attachments use a bayonet or proprietary connector that needs an adapter. Make sure the fitting actually locks; a half-seated coupler can blow off under pressure and leaves a heavy deck with a spinning bar suddenly unconnected.
Finally, look under the deck. The nozzles on the bar have their own orifice size, and on many attachments they can be swapped to tune the deck to your washer. If the manufacturer offers a nozzle chart, match the nozzles to your machine's PSI and GPM rather than leaving whatever came installed. A deck shipped with nozzles sized for 4 GPM will spin poorly on a 2.5 GPM machine no matter how carefully you work.
THE RULE
Flow spins the bar, and the bar does the cleaning.
If the bar is not spinning fast enough, nothing you do with technique will fully fix the finish. Match deck size and nozzles to your washer's GPM first.
2. Prep the Surface Before You Start
Sweep or blow the slab first. A surface cleaner rides on casters about an inch above the ground, and loose gravel, sticks and leaf litter either jam under the skirt or get flung around inside the housing, where they can chip a nozzle or knock the bar out of balance. Five minutes with a leaf blower saves the attachment and stops debris from smearing across concrete you have just cleaned.
Pre-treat oil, rust and organic growth before you bring the surface cleaner out. A surface cleaner is excellent at even general cleaning but it passes over each spot quickly, so it struggles with deep stains that need dwell time. Apply a degreaser to oil drips, an appropriate cleaner to mildew and algae, and give each the dwell time on its label. Our guide to using detergent in a pressure washer covers application without contaminating the pump.
Wet the surrounding planting beds and lawn edges if you are using any chemical, and cover anything that should not take a blast of overspray, such as door thresholds, low vents and outdoor outlets. The skirt contains most of the spray, but water still exits under the brush ring at the edges and along any gap where the deck rides over a joint or a lip.
Plan your route. Work from the high point of the slab toward the drain or the street so dirty water runs onto uncleaned concrete rather than over finished areas. On a driveway that usually means starting at the garage and working downhill. Decide where the hose will trail so you are not dragging it across the strip you just cleaned, which leaves faint lines in the film of dirty water.
3. Connect It and Start Up Safely
Connect the garden hose and purge the air from the system before starting the engine or motor. Squeeze the gun with the surface cleaner disconnected until a steady stream of water comes out, then attach the deck. Running a pump dry, even briefly, is a reliable way to damage seals, and trapped air makes the first minute of spinning erratic.
Set the deck flat on the slab before you pull the trigger. Starting the bar in the air throws water everywhere and lets the bar overspeed with no ground resistance, while starting it flat lets the skirt contain the spray from the first second. Keep both hands on the handle and your feet clear of the deck edge; the bar is enclosed, but the jets underneath are strong enough to cut skin.
Give the washer a few seconds to settle. On gas machines, let the engine reach full speed before you start moving; on electric machines with total stop systems, expect a brief surge as the motor kicks on. Listen to the bar. A steady whir means it is spinning well, while a pulsing or stuttering sound usually means low flow, a partly blocked nozzle or a swivel that is binding.
Keep the washer itself on a level surface away from the area you are cleaning, and run the hose so it cannot kink under the deck's casters. A kinked supply hose starves the pump, drops the flow and slows the bar, which shows up later as an uneven finish that seems to have no cause.
4. Pass Speed and Overlap: Where the Finish Is Made
Move slowly. A common rule of thumb is roughly one foot of travel every one to two seconds, slower on heavily soiled or textured concrete. The deck needs time to sweep each strip several times; push it like a lawn mower and the bar skips across the surface, leaving the swirl pattern of its jets visible once the concrete dries. If you can see a clean arc and a dirty arc side by side as you go, slow down.
Overlap each pass by roughly a third to a half of the deck's width. A 16-inch deck should step over by five to eight inches, not sixteen. The outer edge of a spinning bar cleans less evenly than the middle because the jets spend less time there, so overlapping puts the strongest part of the next pass over the weakest part of the last. Skipping overlap is the single most common cause of the stripes covered in our guide to surface cleaner streaks.
Work in straight, consistent lanes rather than wandering patterns. Straight lanes make overlap easy to judge and keep the dwell time even from one area to the next. Some contractors prefer a back-and-forth lane pattern; others pull the deck toward themselves on every pass. Either works, as long as speed and overlap stay the same from start to finish.
Keep the deck flat. Tilting it to scrub harder lifts one side of the skirt, which lets spray escape, changes the jet distance and leaves a crescent where the low side dug in. If a spot needs more cleaning, go over it again slowly with the deck flat, or come back later with the wand and a turbo nozzle, as covered in our comparison of a surface cleaner vs turbo nozzle.
| Variable | Do This | Not This |
|---|---|---|
| Speed | About 1 ft every 1 to 2 seconds | Walking pace |
| Overlap | One-third to one-half of deck width | Edge to edge |
| Deck angle | Flat on casters | Tilted to scrub harder |
| Route | High side to low side | Random patches |
5. Edges, Steps and Corners
Run a pass along the perimeter first. Ride one edge of the deck tight against walls, curbs and the edge of the slab, then fill the middle with your overlapping lanes. Doing the border first means the field passes blend into it, rather than ending with a last-minute edging pass that looks different from everything else.
Accept that a round deck cannot reach into square corners or tight against posts. Those spots need the wand. Use a 25-degree or 40-degree nozzle held at a consistent distance, and feather the spray outward into the area the surface cleaner has already done so there is no visible boundary. Our guide to pressure washer nozzle colours explains which tip suits which job.
Steps and narrow walks are the other problem area. A deck wider than the tread will hang off the edge, lifting the skirt and spraying sideways. Clean steps with the wand, or use a smaller 12-inch deck if you have one. Do not try to balance a large deck on a narrow step; it is awkward, it does not clean well and it is easy to lose control of on a wet surface.
Expansion joints and control cuts are fine to cross, but slow down as you ride over them. Casters can drop into wide joints and tip the deck, and the jets will blast out joint filler or sand if the deck sits over a joint for long. On pavers, the joint question is bigger, and our guide to pressure washing a patio covers how to protect joint sand.
6. Rinse and Finish the Job
A surface cleaner lifts dirt into a slurry but it does not carry that slurry away. When the cleaning passes are done, switch to the wand with a wide nozzle and rinse the whole area downhill toward the drain or street. Skip this and the dirty film dries back onto the surface as a haze, often in faint swirls that look like the surface cleaner left them.
Rinse in long, even sweeps from the top of the slab down, keeping the nozzle a consistent height above the surface. The goal is to move water, not to clean, so a 40-degree tip or a low-pressure rinse setting is plenty. Pay attention to the edges and the area just below where you finished, where slurry collects.
Let the concrete dry fully before judging the result. Wet concrete hides streaks; dry concrete reveals them. If you see uneven patches after drying, a second light pass over just those areas, at a slower speed with more overlap, usually blends them. If the whole slab shows stripes, the cause is more likely the match between deck and washer than your technique.
If you are cleaning ahead of sealing, follow the sealer manufacturer's dry time, which is commonly at least 24 hours and often longer in cool or humid weather. Our guide to pressure washing a driveway before sealing covers the full prep sequence.
7. Care, Maintenance and Storage
Flush the attachment with clean water after every job, especially if you used detergent. Run clear water through it for 30 seconds or so, then disconnect and tip it to drain. Chemical residue left in the swivel and bar dries into deposits that slow the spin and shorten the life of the seals.
Check the nozzles regularly. A partly blocked nozzle throws the bar out of balance and cleans unevenly; a worn nozzle sprays a wider, weaker fan and lowers the pressure the bar sees. Most decks let you remove the nozzles with a small wrench. Clear a blockage with a nozzle cleaning pin, and replace worn nozzles as a matched set so both sides of the bar stay balanced.
Inspect the swivel and casters. A swivel that feels gritty or turns stiffly by hand will slow the bar, and many manufacturers sell rebuild kits. Casters that drag or wobble change the deck height and the jet distance from the surface. Keep the brush skirt intact as well; a torn skirt lets spray escape and reduces the cleaning effect at the edges.
Store the attachment where it cannot freeze. Water trapped in the swivel and bar expands when it freezes and can crack the housing or split a seal. If you winterize your washer, treat the surface cleaner the same way. Our guide to winterizing a pressure washer covers storage for the whole system.
8. Common Mistakes to Avoid
Walking the deck at mowing pace
Speed is the most common error. A surface cleaner needs time for its jets to sweep each strip many times. Move about a foot every one to two seconds, slower on dirty or textured concrete, or the swirl pattern of the jets will show once the slab dries.
Running passes edge to edge
The outer rim of the deck cleans less than the centre. Overlap each pass by a third to a half of the deck width so the strongest part of the next pass covers the weakest part of the previous one. Edge-to-edge passes leave predictable stripes.
Using a deck too big for the washer
A large quad-nozzle deck on a low-flow electric washer spins slowly and cleans unevenly no matter how carefully you work. Check your washer's GPM and match the deck diameter and nozzle size before blaming technique.
Skipping the final rinse
The surface cleaner loosens dirt but leaves it in a slurry. If you do not rinse it downhill with a wide nozzle, it dries back onto the surface as a haze or faint swirls that look like streaks from the attachment itself.
Tilting the deck to scrub harder
Lifting one side of the skirt changes the jet distance, lets spray escape and leaves crescent marks where the low edge dug in. Keep the deck flat on its casters and make a second slow pass instead of forcing it.
9. Frequently Asked Questions
How fast should you move a surface cleaner?
A common guideline is about one foot of travel every one to two seconds, and slower on heavily soiled or textured surfaces. The bar needs time to sweep each strip several times. If you can see a distinct clean and dirty arc next to each other while you work, you are moving too fast and should slow down.
How much should surface cleaner passes overlap?
Overlap each pass by roughly one-third to one-half of the deck's width. For a 16-inch deck that means stepping over five to eight inches per lane. The outer edge of a spinning bar cleans less evenly than the centre, so overlap is what keeps the finished slab an even colour.
Do you need to rinse after using a surface cleaner?
Yes. A surface cleaner lifts dirt into a slurry but does not carry it away. Rinse the whole area downhill with a wide nozzle afterwards. Without a rinse, the dirty film dries back onto the concrete and often shows as faint swirls or a dull haze across the slab.
Can you use detergent with a surface cleaner?
You can, but most results come from pre-treating the surface rather than running soap through the deck. Apply detergent or degreaser through your washer's soap system or a pump sprayer, let it dwell for the time on the label, then clean with the surface cleaner. Flush the attachment with clean water afterwards.
Will a surface cleaner work on an electric pressure washer?
It can, if the deck is sized for low flow. Electric washers typically supply less GPM than gas machines, so a 12 to 14 inch deck, or one sold as electric-compatible, suits them best. A large deck designed for gas machines will spin slowly on an electric washer and leave an uneven finish.
Can you use a surface cleaner on pavers?
Yes, with care. Keep the deck moving, avoid lingering over joints and consider a lower pressure. The jets can strip joint sand, which then needs replacing. Many owners re-sand with polymeric sand after cleaning. Natural stone pavers may need even gentler treatment than concrete pavers.
Why is my surface cleaner not spinning properly?
The usual causes are low water flow, a deck too large for the washer, partly blocked or worn nozzles, or a stiff swivel. Check the supply hose for kinks, clear the nozzles with a cleaning pin and spin the bar by hand to feel for roughness. A mismatched deck needs different nozzles or a smaller attachment.
Related Surface Cleaner Guides
Buyer's Guide
Best Pressure Washer Surface Cleaners
Seven attachments ranked by evenness, speed and which washers they actually suit.
Guide
Surface Cleaner Leaving Streaks?
Zebra stripes and swirl marks traced to overlap, speed, nozzles and flow.
Buyer's Guide
Best Pressure Washers
Gas and electric washers ranked by real flow, which decides what deck you can run.
The Bottom Line
Using a surface cleaner well comes down to four things: a deck matched to your washer's flow, a slab prepped and pre-treated, slow passes with generous overlap, and a proper rinse at the end. Most stripes and swirls trace back to one of those four.
If your current attachment fights your washer no matter how carefully you work, the fix is a better-matched deck rather than more effort. Our surface cleaner rankings show which models suit which machines.
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About the Author
Alex Rivers, Home Improvement Editor
Alex has spent over a decade working on residential and light commercial property maintenance, and now tests every tool, coating and machine that appears in these guides personally.