We had a leak in a faucet which flooded our basement (only about a 1/2 inch deep). Ever since then, the smell has been awful. We have a floating basement and I think that the smell is coming from the the space between the slab and the wall. Any ideas on zapping a full size basement for mildew? I would think that it would take several gallons of bleach to get the whole slab. Is there a better way?