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I got a call today about doing some pressure washing of a 200,000sq foot metal, standing seam roof in preparation for a roof coating application. The roof just has surface dirt that needs to be removed before it can be coated. I would have 2 possibly 3 pressure washers running. This is the largest job I have been asked to estimate and I don't want to price it too low but, want to be fair.  I was thinking between .10-.20 per square ft because of the large area.  Am I in the ballpark?