Pressure WashingIn Hillsboro.

Between newer driveways in Orenco Station and Tanasbourne and older concrete closer to downtown Hillsboro, moss and algae buildup shows up on a different timeline depending on the age and shade of the property.

Pricing depends mainly on square footage, surface type, and how much buildup there is to remove — a driveway with years of moss growth takes more time than a lightly dirty one. Oregon’s wet climate means moss and algae buildup is a bigger factor here than in drier parts of the country, which is part of why pressure washing tends to matter more for PNW homeowners than a one-time cosmetic fix.