I tried on the mirror of the bathroom and taps. Pre-cleaning and passage of household white vinegar to remove limescale. The first printing after spraying the product and passing the cleaning cloth: it shines! No sign on the mirror. That's something ... 2nd KissKool effect: it should give a water repellent effect, so the water should flow better and limestone least cling since water does not evaporate while my taps ... then my opinion is mixed. There is a slight effect but not obvious on the stainless steel taps. Supposed to be more effective on vertical surface after record, I plan water on the mirror and ... same result with or without the product !!
So I am not convinced by this product. I will return anyway reassess the note in a few weeks after renewing applications. There may be a cumulative effect ...