I too am one of the testers. Have my shower enclosure made of clear glass so cleaned and rubbed and rubbed and rubbed. Dry it did not want to be, but the cloth is much too small. So taken and rubbed another microfiber cloth ..... It was sometime dry, the lime stains were gone. Class ............ until the sun came up. My God, rarely had such a smeared shower wall. But perhaps pearls so now the water off as nothing. The first showers the water bubbled from as always, the second time: as usual, etc. Get the discs now deal with it again, perhaps it will be better. Until now: Definitely not for buy recommendation.