I have an opportunity to give a bid on cleaning a Bldg. . It was a training facility for construction and there is grain sized to large I-Beam type of a mess. They want a general clean with some heavy stain on VCT type tile removed as best as can with out too much trouble,They will supply the dumsters and I figure about( 1 1/2) 20 yard dumsters, two people four to five 8hr days so 32 man hrs. I am not sure what to charge for this type of clean-up? Please advise?