How to Pressure Wash a Concrete Patio in Mars, PA

Mars, PA sits at the edge of some of the heaviest tree cover in the North Pittsburgh suburbs, and that shade is exactly what makes concrete patios here dirty faster than driveways out in the open. Add in a winter that swings across freezing dozens of times and you get a surface that looks fine from the back door but is quietly picking up damage every season it goes uncleaned.

Why patios in this area get dirty fast

A shaded patio under mature trees stays damp longer after rain or dew than a sun-exposed driveway does. That extra moisture is what algae and mold need to take hold, and it's why you'll often see a green or black tint creeping across a patio in Mars or Adams Township well before the rest of the property shows it. Leaf litter and pollen add to the problem — organic material breaks down on the surface and works its way into the pores of the concrete, feeding the growth instead of just sitting on top of it.

Then there's the freeze-thaw cycle every Western Pennsylvania winter brings. Water that's soaked into a dirty, porous patio expands when it freezes and slowly widens hairline cracks. A clean patio doesn't just look better — it has less debris packed into the surface for water to freeze around in the first place.

Our process for a concrete patio

Clear and pre-treat. We move furniture and planters, sweep loose debris, and apply a cleaning solution to break down algae, mold, and embedded organic staining before any water pressure is applied. Skipping this step just pushes dirty water around instead of lifting the stain out.

Wash at the right pressure. Concrete can handle higher pressure than siding or wood, but that doesn't mean more is better. Too much pressure too close to the surface can etch the concrete or carve visible lines into it, especially on patios that were sealed or stamped. We work at a pressure and distance matched to the condition of the slab.

Pay attention to joints and edges. Where the patio meets the house foundation, garden beds, or a paver walkway, dirt and organic growth tend to concentrate. These transition points get extra attention since they're usually the first place staining reappears if it's missed.

Rinse and let it dry clean. A thorough final rinse clears loosened debris and cleaning solution so nothing re-settles into the surface as it dries.

Sealing makes the next cleaning easier

A sealed patio sheds water, oil, and organic debris instead of absorbing it, which means less staining sets in between cleanings. If your patio was never sealed or the sealant has worn thin, we always recommend washing first — sealing over embedded dirt or algae just traps it under the coating, where it keeps working on the concrete instead of sitting on the surface where a wash can reach it.

How often a Mars-area patio needs it

Given the tree cover common around Mars, Adams Township, and the rest of the Route 228 corridor, a shaded patio often needs cleaning more like once a year rather than the 18-month window a sunnier property might get away with. If your patio backs up to woods or sits under a big oak or maple, lean toward the shorter end of that range.

If you're not sure whether your patio needs attention now or can wait until spring, we're happy to take a look. We serve Mars, Adams Township, Cranberry Township, and the greater North Pittsburgh area — reach out and we'll give you a straight answer.