Watch Product review of Grout Bully. Dont waste your time on this crappy product. I tested it so you dont have to. This product does not work as advertised and it cost $15.90 shipping and handling for a ridiculous total of nearly $30. They claim to have a money back guarantee but they will not give you back the $15.90 s and h only the $9.99 or $10 depending on when you bought the product. It cost me $5.80 to return the product, so my money back guarantee got me $4.19 back when I spent a total of $33.32. Not much of a money back guarantee is it?Im not a fan of Grout Bully.