If the concrete still bears a mark, don rubber gloves and goggles and do the following: Mix one cup of trisodium phosphate in 1 gallon of hot water, then pour the solution over the stain.

Sweep away dirt, vacuum the dust bunnies from the corners, and use a pressure washer or concrete cleaner to remove grease, oil spots, or any stubborn stains. Rinse with clean water. Make sure to ...