I need to get some grout and tile cleaning spray from the store. Who makes the strongest stuff? The people renting this house must have never cleaned their shower even once because it is absolutely caked on.
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I would take a small cup of bleach and a toothbrush and dip the toothbrush in the bleach and brush it out. Then I would follow it with clear water to rinse!
The brands that would be best for grout cleaning are : Mapei , KRC-7, Grout sensation, Zep inc. You could also use a grout removal tool or a grout sponge.