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 bathroom.

Some grout cleaners need time to activate, such as this Zep tile and grout cleaner. This gel-like formula de-gunks grout after only three minutes and requires less scrubbing than others.

Zep Grout Cleaner and Brightener Zep Grout Cleaner and Brightener $8.79 at Amazon Grout Pen White Tile Paint Marker Grout Pen ...