Saves Much Elbow Grease!
I must say this stuff does an excellent job on tile grout,  with a lot less elbow grease!  My only gripe would be the translation to English from Chinese---really poor!  The review is however, for the product and not grammar or spelling.  In the past we have had tiled shower and tub enclosures, what a pain to keep clean, wish this was available then!  Very pleased with this product.
Rating: 4 stars