What driveway and concrete cleaning does
Concrete looks tough, but it is porous. Motor oil, tire marks, leaf tannins, and the algae that thrives in Chicago humidity soak in where a garden hose cannot reach. The wash uses a flat surface cleaner: a spinning bar of high-pressure jets enclosed in a shroud.
A stream above 3,000 PSI can strip years of grime off concrete in seconds. The same wand carves the slab when the tip is wrong or it stays in one spot. Concrete and brick can take 2,500–3,000 PSI. The nozzle tip controls how concentrated that pressure is:
- Red (0°) — a pinpoint jet. Almost never appropriate for home surfaces; it will carve lines into concrete.
- Yellow (15°) — heavy stripping for bare concrete and rust stains.
- Green (25°) — the everyday tip for driveways, sidewalks, and patios.
- White (40°) — siding, fences, and painted surfaces.
- Black — low pressure for applying detergent.
Start with the nozzle 18–24 inches from the surface and sweep in smooth passes. If a stain is not lifting, let the cleaner dwell for 5–10 minutes instead of moving closer or raising the pressure. Spraying a dry surface drives dirt deeper and leaves streaks, so the slab is wet down before any cleaner goes on.
Pressure washing uses a high-volume stream, typically 1,500 to 3,500 PSI, and the cleaning power is mechanical force. It fits the surfaces below. Soft washing stays under 500 PSI. On a driveway it is slow and leaves the concrete streaky, so flatwork stays a pressure job. Vertical surfaces on the same property are a house and siding soft wash.
Surfaces
- Concrete driveways
- Sidewalks and walkways
- Patios
- Garage floors
- Pool decks
- Steps and stoops
- Paver and stone hardscapes
- Curbs and aprons
- Unsealed masonry
How oil and rust leave the pores
Blasting the top of an oil stain rarely finishes it. The driveway dries, and the stain ghosts back as oil migrates up through the pores, so the contaminant has to come out of the concrete. Oil and rust do not come out the same way.
Oil is greasy and organic, so it responds to degreasers and heat, not pressure alone. A fresh spill is blotted with cat litter, sawdust, or an oil absorbent, left for a few hours, and swept up, so less oil is left in the pores. Set-in oil takes an alkaline or citrus-based concrete degreaser worked in with a stiff bristle brush. Dish soap is too weak for a stain that has set. The degreaser dwells for 10–15 minutes so it can penetrate and emulsify the oil, and it is reapplied if it starts to dry. Hot water at 180–200°F thins the oil and breaks the emulsion, which is why it pulls more stain than cold water. Deep stains often need two or three rounds of degreaser and extraction. A poultice — an absorbent paste that draws oil out as it dries — is for the worst cases.
Rust is a chemical stain. Degreasers and pressure do almost nothing to it, so rust needs acid. Typical orange stains take an oxalic-acid rust remover. Heavy stains from battery acid or fertilizer can need a stronger acid. It is applied, left to dwell, agitated with a brush, and rinsed thoroughly. Left on too long, acid can etch and lighten concrete, and it burns plants and skin. Never combine a rust acid with bleach or an alkaline degreaser: the reaction releases chlorine gas. One product is rinsed away completely before the next goes on.
Most oil, tire, and rust marks lighten or come out. One that has soaked in for years may not vanish, which is stated after the inspection. A light, fresh stain is the do-it-yourself case. Years-old oil shadows, large rust patches, and a driveway that will be sealed afterward need hot-water equipment and the right chemistry. See how oil and rust stains are lifted out of a driveway.
How a driveway wash is done
- The slab is walked to map oil drips, rust, gum, and algae, note any cracks or spalling, and clear loose debris so nothing is ground in during the wash.
- Organic algae and mildew get a biodegradable cleaner. Each stain treatment dwells so it can break its bond with the concrete before any pressure touches the slab.
- The surface cleaner makes slow, overlapping passes at a PSI matched to the slab. Older or already-spalling concrete gets a gentler setting, which avoids the etching and gouging from a narrow wand tip held too close.
- Expansion joints, edges, corners, and any stain the surface cleaner cannot reach are hand-detailed so the borders match the rest of the slab.
- The area is rinsed and loosened grime is flushed away from landscaping and storm drains, so no muddy film dries back onto the concrete. Nearby plants are pre-wet and rinsed afterward so detergent runoff does not scorch them.
- We walk the property with you, confirm the result, and pick up after ourselves.
Optional concrete sealing
A penetrating concrete sealer is optional, and in the Chicago area it is worth considering. Right after the wash is the ideal time. It fills the pores so the next oil drip or rust source cannot sink in, and it helps the surface shed oil, water, and de-icing salt. Reseal every 2–3 years. Sealed concrete then cleans up with a simple rinse instead of a full restoration. Sealing is quoted on request.
How often to wash driveways and walkways
Driveways and walkways are pressure washed once a year. Algae makes concrete slippery, so the annual wash keeps the footing safer and the slab looking new. A heavy-use driveway may want a mid-season touch-up. Spring and fall fit the Chicago calendar: spring clears the salt, sand, and grime a Midwest winter leaves behind, and fall takes off leaf stains before the freeze. Warmer months work whenever the temperature lets the surface dry properly.
A grimy, oil-blotched driveway is the first thing visitors and buyers notice. Dirt and de-icing salt hold moisture against the slab, and in a freeze-thaw climate that moisture widens cracks, pits the surface, and shortens the life of the concrete. Wash sooner under heavy tree cover or shade, in high humidity, near water, or where construction or a busy road leaves dust. A fresh wash is one of the highest-ROI moves before listing. For siding, roofs, and wood, see how often to wash a house.
Where driveway cleaning is available
Ernest Power serves Chicago and the greater Chicagoland area, including DuPage, Kane, and McHenry counties, and McHenry. Towns:
- Naperville
- Wheaton
- Hinsdale
- Oak Park
- Downers Grove
- Glen Ellyn
- Lombard
- Elmhurst
- Schaumburg
Don't see your area? Call — we may still be able to help.
Get a quote
The driveway assessment is free and has no obligation. Call (630) 403-0027 or email hello@ernestpower.com. The office is at 1429 Diehl Rd, Suite 200, Naperville, IL 60563. Hours are Monday to Friday, 7 am to 9 pm, and Saturday and Sunday, 7 am to 5 pm.
Send the property details from the contact page. Decks, fences, roofs, and commercial washing are separate services.