I was looking for a product to clean and make disappear the traces of drops on the walls of a shower stall. Indeed it is frustrating to see the walls of a shower tarnish because of limestone. Yet in my town water is poor in limestone, but the time being I can not escape the traces. I was using before the white vinegar method which gave a satisfactory result but had the disadvantage of having to be done regularly and especially it gives a pretty bad smell in the bathroom. So I cleaned my first old walls to remove existing traces up then I applied the product (it is supplied in 500ml) and then it's pretty amazing, it's like the surface was totally waterproof and it slides without trace. If you have shower enclosures, I suggest you clean them and then applying this product, the result is stunning.
EDIT: After two weeks of use I still found that the effect lasts manages more than a few days ... On the shower enclosure must apply at least once a week for this to be effective. By cons, there or the product is really effective, and where I have never given product since first use: the mirror in the bathroom. Since I made the product the first time, no more and no trace fog on the mirror!