Graham FisherBy Graham Fisher

Updated November 2026

Using a pressure washer on concrete is one of the fastest ways to lift oil stains, mildew and years of grime from a driveway, patio or walkway. Done correctly, you’ll get a clean surface without etching the concrete or leaving streaks. This guide walks through preparation, settings and technique so you can get consistent results on your first attempt.

Prepare the Surface Before You Spray

Preparation makes the difference between a quick rinse and a deep clean. Sweep away leaves, loose gravel and debris, then move planters, furniture and vehicles off the area. Pre-wet the concrete with a garden hose so it’s easier for detergent to bond with stains.

Check for cracks, loose joints and spalling (flaking surface layers). High pressure can widen cracks or strip weak concrete, so address those problems first or work more gently around them.

Choose the Right Nozzle and Distance

Nozzle choice controls how aggressive your pressure washer on concrete will be. Most units use color-coded tips, and the general rule is that narrower spray angles deliver more force. For most driveways, a 25-degree (green) tip works well. Reserve a 15-degree (yellow) tip for stubborn stains and heavily soiled areas, and keep it moving.

Hold the wand roughly 12 to 18 inches from the surface to start. If you see the concrete turning lighter or looking scoured, back off. A 0-degree tip should never be used on concrete because it can gouge the surface.

Apply Detergent and Clean in Sections

  1. Switch to the low-pressure soap nozzle or detergent tank and apply a concrete-safe cleaner from the bottom of the area upward.
  2. Let the detergent dwell for 5 to 10 minutes, but do not let it dry on the surface.
  3. Switch back to your working nozzle and rinse in overlapping passes, working in strips about 2 feet wide.
  4. Keep the spray angled roughly 45 degrees to the surface to reduce the chance of marking.
  5. Rinse the entire area with clean water once you finish, moving from the far edge toward you.

Working in sections keeps the surface wet enough to show you where you’ve cleaned and where you still need to go. It also prevents detergent from drying into residue.

Tackle Stubborn Stains

Oil and grease usually need a degreaser and a longer dwell time. Mildew responds well to a cleaner containing sodium hypochlorite, but always rinse thoroughly and keep runoff away from plants and lawns. Rust stains often need a dedicated rust remover, applied according to the manufacturer’s directions.

  • Concrete-safe surface cleaner attachment: A rotating head spreads the spray evenly and reduces the striping you can get from a wand. View on Amazon
  • Pressure washer degreaser for concrete: Formulated for oil and grime, it helps lift stains before rinsing. View on Amazon
  • Extension hose for power washer: A longer hose lets you reach the far side of a driveway without dragging the unit around. View on Amazon

Common Mistakes

  • Using a 0-degree or 15-degree nozzle too close to the surface, which can etch or pit the concrete.
  • Letting detergent dry on the surface, leaving a dull film.
  • Spraying in circles instead of overlapping straight strips, which causes visible swirl marks.
  • Skipping a pre-wet, so stains resist and you end up over-spraying.
  • Ignoring nearby plants and windows, which can be damaged by detergent or spray.

For further reading, see Top 5 Pressure Washer Sidewalk Cleaner Picks for Concrete and Pavers for surface cleaner options, and Why Does My Gas Pressure Power Washer Lose Pressure? 6 Causes and Fixes if your unit isn’t delivering the force you expect.

FAQ

What pressure setting is safe for concrete?

Most homeowners use a pressure in the 2,000 to 3,000 PSI range for driveways and patios. Check your unit’s rated PSI and choose the nozzle and distance that keep the surface looking uniform.

Can a pressure washer damage concrete?

Yes, if it’s too close, too strong or the wrong nozzle is used. Aged or cracked concrete is especially vulnerable, so start with a wider spray and test a small hidden area first.

Should I seal concrete after pressure washing?

Sealing is optional but helpful once the surface is fully dry, usually after a day or two. Follow the sealer manufacturer’s guidance on temperature and drying time.

Conclusion

A pressure washer on concrete can restore a driveway or patio quickly when you match nozzle, distance and detergent to the job. Prepare the surface, work in overlapping sections and rinse thoroughly to avoid streaks. If you’re dealing with cracked or deteriorating concrete, consult a professional contractor before using high pressure.

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Graham Fisher

About Graham Fisher

Graham Fisher is part of our editorial team and reviews and edits our non-vacuum cleaning gear guides, checking product details against manufacturer specifications and owner feedback.