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Question DetailsAsked on 3/22/2017

how much should it cost to pressure wash 11,615 square feet of concrete and remove gum and graffiti

how much time chemicals involved,

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1 Answer


Commonly about $0.15-0.25/SF for large areas like that assuming this is within reach of the ground (no lift needed, so within about 7 feet or ground if lap siding (so man on ground doesnot spray up under it), or within about 10 feet of ground if concrete/stucco or similar surface. - but that assumes the grafitti will comes off with power washing and is sporadic - not heavy coverage like a grafitti wall or a bridge abutment which is the local tagging spot, which can run over $1/SF and commonly involves use of solvents and/or sandblasting (at more like $0.50-1.50/SF) as well. Which is why many government and commercial owners have changed from cleaning (unless using people doing court-ordered community service) to overspraying grafitti with a cementatious paint or just plain acrylic latex gray paint, at typically around $0.25-0.40/SF for large areas.

This assumes there are not environmental cleanup regs - in some areas (like CA) this sort of cleaning now requires containment and treatment of the water (or sand) because it contains hazardous materials in the paint - which can push the cost per SF to well over $1 wioth water or dry ice and over $2/SF with sandblasting.

Answered 3 years ago by LCD

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