This product presents a truly original concept: it is sprayed onto the surfaces that you want to make water-repellent and it is spread with Vileda mop provided. We must therefore take into account the intended use: this is not a detergent but a system intended to prevent or reduce fouling. I tested the formula in the bathroom: the effect on the tub is spotless; water flows and slides without settling, so, no limestone flows. Ditto for the sink. Where I found really useful product, it's for the shower and faucets. I waterproofed my marble tiles and the effect is magical: no record and a shiny effect as if it had just been washed, even after 6 showers! On the mirror, almost no mist, it is really effective! For coverage and more protection, you only have to spray more material on the walls. The concept is afraid not be too economical because I put a lot, but the effect on chrome materials and the shower is impeccable. I am delighted and I think to try it on the windshield of my car, for antifog side, it should be not bad!