I normally do residential work, but need to submit an estimate for a self storage facility. It's roughly 68,000 square feet of concrete that needs cleaning. If I calculate my average driveway price to come up with a square foot price, I'm unsure how much to reduce it do to the sheer size of the job. I'm trying to use the "buying in bulk" logic to price it compared to a 1000 sq ft double driveway for instance. Any advise would be appreciated, I want to be fair, make some money, yet not be underbid either. Thanks!