Pressure wash a concrete driveway at 3,000 to 3,500 PSI using a rotary surface cleaner, not a hand wand. Pre-treat organic growth with a hypochlorite solution, work in overlapping passes, and treat oil and rust separately with the right chemical afterwards. The tool matters more than the machine: a wand is what produces the striped zebra pattern you see on half the driveways in Jacksonville, and once it's there the only fix is re-cleaning the whole slab.
Below: what PSI you actually need, why the surface cleaner is the whole game, the method step by step, treating stains, the mistakes that leave permanent marks, and an honest DIY-vs-hire comparison.
What PSI you actually need
For concrete, 3,000–3,500 PSI. Below about 2,500 you'll struggle to lift embedded dirt and you'll end up going over areas repeatedly, which is itself a way to cause damage. Above 4,000 you're into territory where a moment's carelessness etches the slab.
But PSI is only half of it, and it's the half everyone quotes. The other half is GPM — gallons per minute. PSI breaks the bond between dirt and concrete; GPM carries the dirt away. A 4,000 PSI machine at 2 GPM will clean more slowly than a 3,000 PSI machine at 4 GPM, because it can't flush what it's loosened.
This is the main practical difference between a consumer electric washer and professional gear: the pressure figures look comparable, the flow rates aren't close.
| Surface | PSI | Tool / tip | Standoff |
|---|---|---|---|
| Concrete, open slab | 3,000 – 3,500 | Rotary surface cleaner | Fixed by the housing |
| Concrete edges & joints | 3,000 – 3,500 | 25° tip | 10–12 in. |
| Concrete under 12 months | 2,500 – 3,000 | Surface cleaner | Keep moving |
| Brick pavers | 2,000 – 3,000 | Surface cleaner | Higher blows out joint sand |
| Stamped / decorative concrete | 2,000 – 2,500 | 40° tip | 12–18 in. |
| Garage floor | 3,000 – 3,500 | Surface cleaner + degreaser | — |
Why a surface cleaner wins
A rotary surface cleaner is an enclosed disc with two or four jets on a spinning bar underneath. Two things follow from that design, and together they are the difference between a professional finish and a ruined driveway.
The jets sweep a continuous circle. As you walk it forward, every square inch receives the same number of passes at the same angle. There is no such thing as a "missed" strip.
The housing fixes the standoff. The nozzles sit at a set height above the slab and can't get closer. You physically cannot linger the way you can with a wand.
A hand wand puts a single fan of water on the concrete. To get an even result you'd have to overlap every pass perfectly, at constant speed and angle, across 600 square feet. Nobody can do that. The result is the striping, and the fix is re-cleaning the entire slab with a surface cleaner so the whole area gets one consistent treatment.
Surface cleaners start around $80 for a consumer model. If you're doing this yourself and buy one thing, buy this rather than a more powerful machine.
The step-by-step method
- Clear and sweep. Move vehicles, planters, bins. Sweep loose debris — you don't want it becoming a projectile.
- Protect. Pre-wet planting and grass at the edges. Cover anything that shouldn't get wet. Check nearby garage door seals.
- Pre-treat organic growth. Apply a dilute hypochlorite solution to any green or black film and let it dwell 5–10 minutes. This does the work so you don't have to compensate with pressure — and it kills the growth so it doesn't return in eight weeks.
- Treat stains individually before the main clean — degreaser on oil, rust remover on orange staining. See below.
- Wet the whole slab with plain water first, so nothing dries with chemical on it.
- Surface-clean in overlapping passes. Overlap each pass by about a third. Move at a steady walking pace and don't stop. Work with the slope so dirty water runs away from clean areas.
- Detail the edges with a 25° tip — the perimeter, expansion joints, the garage apron and around drains.
- Final rinse the whole slab, plus the kerb and gutter so runoff doesn't dry and stain.
Timing: about 60–90 minutes for a standard two-car driveway with a surface cleaner. The same job with a wand takes three to four hours and rarely looks as even.
Oil, rust and the stubborn stains
None of these respond to pressure. Turning the machine up is the single most common way people damage a slab trying to remove a stain that was never going to move.
| Stain | Treatment | Realistic result |
|---|---|---|
| Oil / transmission fluid | Degreaser, brush, 10–15 min dwell, rinse; poultice if old | 70–95% |
| Rust from irrigation | Oxalic-acid remover, dwell, rinse | 90–100% |
| Red clay tyre marks | Alkaline pre-treat, then surface clean | 95–100% |
| Black algae film | Hypochlorite pre-treat | 100% |
| Oak tannin (brown) | Alkaline degreaser — bleach won't touch it | 80–95% |
| Battery acid | Neutralise; pitting is permanent | Colour only |
Rust is the big one locally. Much of St. Johns County and Nocatee irrigates from iron-rich wells, and the orange arc on the driveway is the sprinkler's spray pattern written in rust. Treat it, then turn the head.
Mistakes that leave permanent marks
- Pausing with the trigger down. Instant etching. Release before you stop.
- Using a 0° red tip. There is no job on a driveway that needs it. It will carve a line.
- Cleaning only the dirty half. You create a visible boundary you then have to chase across the whole slab.
- Letting chemical dry on the surface. Leaves a ghost mark. Keep it wet.
- Washing new concrete hard. Under 12 months it hasn't reached full strength.
- Turning the pressure up to fight a stain. You'll etch the concrete and the stain will still be there. This is the classic route to dark patches after washing.
DIY vs hiring it out
| DIY | Professional | |
|---|---|---|
| First-time cost | $350 – $700 (machine + surface cleaner + chemicals) | $129 – $189 |
| Time | Half a day | 60–90 minutes |
| Finish | Good with a surface cleaner; striped without | Even |
| Stain treatment | Extra chemicals, trial and error | Included or +$45 |
| Risk | Etching is on you | Insured |
If you own the gear already, do it yourself — this is genuinely a DIY-able job, unlike a roof. If you're buying equipment for one driveway, the maths doesn't work until about the third clean.
My honest take
Driveways are the most satisfying thing we clean and the easiest to get visibly wrong. If I could give one piece of advice to someone doing it themselves it's this: buy the surface cleaner, not the bigger machine. A modest 3,000 PSI unit with a proper surface cleaner will beat a 4,000 PSI machine with a wand every single time, and it'll do it in a third of the time.
The other thing: pre-treat. Almost everyone skips it, and it's why DIY driveways look great for a month and green again by the summer. Thirty seconds of hypochlorite and a ten-minute wait is the difference between removing algae and killing it.
And don't seal a plain grey driveway. It's a recurring cost, it can go blotchy, and standard broom-finish concrete gains almost nothing from it. Save sealing for pavers and decorative surfaces — our paver sealing guide covers when it's genuinely worth it.
Want it done instead? Our driveway cleaning service covers all of Jacksonville and the First Coast, or see the full price guide.
