Borax is a good mold and mildew solution. This alkaline mineral is found in the laundry aisle and can also be used in place of washing soda as a cleaner. For an extra-strength toilet bowl cleaner, pour 1 cup of borax into the toilet before going to bed and scrub and flush next morning. One note: borax can be toxic when swallowed, so take extra care when using and storing it.