"Power washing" gets used as a catch-all, but there are really two different ways to clean a patio — and using the wrong one is one of the most common ways a patio gets quietly damaged. The choice comes down to soft washing versus pressure washing. This guide explains how they differ, which surfaces each is safe for, and why the answer often depends on whether you're fighting dirt or fighting algae.
Pressure washing — cleaning with force
Pressure washing uses high water pressure to physically remove dirt, grime, and surface growth. On the right surface it's fast and satisfying. The risk is that the same force that lifts grime can also lift the surface itself — etching concrete, blasting the polymeric sand out of paver joints, and pitting or roughening softer natural stone. The damage frequently isn't visible the day of; it shows up as joints that wash out, a surface that re-soils faster, and a prematurely worn look.
- Best for: solid concrete, ground-in dirt, grease, and tire or grill stains.
- Watch out on: pavers (joint-sand loss), natural stone (pitting), and any sealed surface.
- Limitation: blasts growth off the top but leaves the algae/mold spores behind, so it returns.
Soft washing — cleaning with chemistry
Soft washing uses low pressure — closer to a strong garden hose — paired with cleaning solutions that kill algae, mold, mildew, and moss at the root. Because almost no force touches the surface, it's safe for delicate materials, and because it sanitizes rather than just rinses, the green-black organic staining so common on shaded Ohio patios comes back far more slowly — see our guide on why a patio keeps turning green and slippery every year for the full clean-and-seal fix. The trade-off is that soft washing is about killing growth, not muscling off heavy ground-in dirt or stains.
- Best for: algae, mold, mildew, and moss; natural stone, delicate pavers, and sealed surfaces.
- Advantage: kills growth at the root, so the patio stays clean for more of the season.
- Limitation: not the tool for stripping heavy grime, grease, or tire marks on its own.
Which method by surface
| Surface | Recommended approach |
|---|---|
| Concrete | Controlled pressure for dirt/stains, plus a soft-wash rinse for algae |
| Pavers | Low-to-moderate pressure or soft wash; protect joint sand, plan to re-sand |
| Natural stone (flagstone, travertine, sandstone) | Soft wash — high pressure pits and roughens stone |
| Sealed patios | Soft wash / gentle methods to avoid stripping or clouding the sealer |
The honest answer for most Columbus patios
The two methods aren't rivals — the best results usually combine them. A common professional approach is to clean with the gentlest method that will do the job, use controlled pressure only where the surface can take it, and finish with a soft-wash treatment so the organic growth doesn't simply grow back. That's exactly how we approach patio power washing, paver cleaning & sealing, and natural-stone patio care across the Columbus area — matching the method to the material rather than reaching for the highest pressure available.
If a clean patio is the first step toward sealing it, getting the cleaning right matters even more: a sealer only performs over a properly cleaned, undamaged surface. For what comes next, see our guide on the best time of year to seal a patio in Central Ohio and how often you should re-seal.
Not sure whether your patio needs a gentle soft wash or controlled pressure cleaning? We assess the surface and the type of staining first, then use the safest effective method. Estimates are always free and no-obligation for Columbus and the surrounding suburbs.