This product has been specially formulated for use only in vitreous china/glazed porcelain toilet bowls, bidets, and urinals. It should not be used or placed on toilet bowl lids, vanities, sinks, bathtubs, cabinets, countertops, rugs, etc. This product may cause rust on metal, wire, bristle brushes. Clean up spills and drips immediately. Do not use with chlorine bleach or any other chemical products.