Pressure washing is the standard way to clean driveways, sidewalks, and patios. But the wrong nozzle, distance, or technique can leave lasting marks. Here is what to know.
The Short Answer
Pressure washing does not damage sound concrete when it is done correctly. Damage comes from holding a narrow nozzle too close, using too much pressure on soft or worn surfaces, or cleaning concrete that is already cracking or flaking.
What Damage Looks Like
- Etching or “wand marks”: lines carved into the surface by a tight stream.
- Stripes: uneven cleaning from sweeping a wand back and forth.
- Exposed aggregate: the top layer worn away, showing the stones underneath.
- Worse spalling: loose, flaking areas breaking up further.
What Causes It
- Using a zero-degree or very narrow nozzle
- Holding the tip inches from the surface
- Cleaning new concrete before it has fully cured
- Blasting damaged or sealed decorative concrete
How to Pressure Wash Concrete Safely
Use a surface cleaner
A rotary surface cleaner spreads the pressure evenly and avoids stripes.
Pre-treat instead of blasting
Degreasers and algae cleaners do the heavy lifting on stains, so you do not need extreme pressure. See oil stains and algae on concrete.
Keep a steady distance
Keep the wand moving and at a consistent distance for edges and corners.
Inspect first
Check for cracks and flaking before cleaning, and go gentler on older or decorative surfaces.
What About Pavers and Stamped Concrete?
Pavers need lower pressure to protect joint sand, and stamped or sealed concrete needs care to avoid stripping the sealer. See how to clean a concrete patio and pavers.
Leave It to a Pro
Our driveway and concrete cleaning uses surface cleaners and pre-treatments for an even result. Most driveways cost $150 to $300. For a full walk-through, see how to clean a concrete driveway.
Ready for a quote? Call 817-580-9881 or request a free estimate online. We serve Arlington, Fort Worth, Dallas, Grand Prairie, Mansfield, and the rest of our DFW service areas.
FAQs
Can pressure washing damage concrete?
It can if the nozzle is too narrow, held too close, or used on weak or damaged concrete. Done correctly, it is safe for sound concrete.
What PSI is safe for concrete?
Sound concrete can handle a typical residential pressure washer when paired with a surface cleaner and the right nozzle. Older, decorative, or damaged concrete needs a gentler approach.
Why does my driveway have stripes after pressure washing?
Stripes come from sweeping a wand unevenly. A rotary surface cleaner gives an even finish.
How soon can you pressure wash new concrete?
Wait until the concrete has fully cured. Ask your contractor for the recommended time for your slab.
