Concrete is one of the toughest surfaces around your home or business, so it's easy to assume you can't hurt it. But the wrong pressure washing technique can leave permanent marks on a driveway, sidewalk, or patio. Here's what causes damage and how to avoid it.
How pressure washing can damage concrete
- Etching and "wand lines": A narrow, zero-degree tip held too close cuts into the surface paste and leaves stripes or swirls that don't wash out.
- Exposed aggregate: Too much pressure in one spot can wear away the top layer and expose the stones underneath.
- Damaging new concrete: Fresh concrete needs time to cure before it's pressure washed.
- Sealer damage: High pressure can strip or haze an existing sealer on stamped or decorative concrete.
- Spalling and cracks: Concrete that's already flaking or cracked can get worse if water is driven into those areas.
How professionals clean concrete safely
Most professionals use a surface cleaner, a round tool with spinning nozzles, instead of a wand for flat concrete. It cleans evenly at a consistent height, so there are no stripes. Hot water and a degreaser lift oil and grease stains without needing extreme pressure. Rust stains from fertilizer, sprinklers, or metal furniture usually need a dedicated rust remover, not more pressure.
How long does it take to pressure wash a driveway?
A typical residential driveway often takes one to two hours, depending on its size, how dirty it is, and whether there are oil or rust stains that need extra treatment. Adding sidewalks, a patio, or a pool deck adds time. It also makes sense to do them in the same visit.
Tips if you're doing it yourself
- Use a surface cleaner or a 15- to 25-degree tip, never a zero-degree tip.
- Keep the tip at a consistent distance and keep it moving.
- Pretreat oil stains with a degreaser.
- Test a small hidden area first, especially on stamped or sealed concrete.
- Rinse dirty water off toward the street or yard, not into flower beds.
When to call a pro
If you have oil stains, rust, a large driveway, or decorative concrete, professional cleaning is usually faster and safer. Texas Commercial Wash offers driveway pressure washing and concrete cleaning for homeowners and businesses across League City, Galveston County, and Houston, with hot water equipment for grease and oil. See our residential services or commercial concrete cleaning.
Request a quote or call/text 281-512-5223.