The injected epoxy forms a waterproof layer under the tile shower floor. In warm weather you can grout ground the next day. Small amount of mold seen on non-porous surfaces (such as tile and varnished wood) can be cleaned with non-ammonia soapy hot mineral water. http://nccproduction.com/wiki/how_to_sell_a_messy_diso_ganized_and_dated_home_fo_funds