Cue Zep, a grout cleaner and brightener. People claim it takes years off old grout, lifts heavy stains, and works in minutes. I decided to try Zep on the grout of the porcelain floor tile in my ...

"It will eat metal so pipes and drain covers ... cracks and leaks caused by the use of off-the-shelf cleaners and clog removers. Using the ZEP Crystal Heat Grease Clog Dissolver is not recommended ...