Since I was, like many others here, a victim stainless Magnets, I have this Wenko bought holder, who had held in the past very well to a purified tile (and of course the rust was). As Tunning I have a high-performance magnets 20mmx1mm bought with nickel sheath and this so glued to the galvanized built with 2K adhesive that it is fully protected from water contact. The magnet costs about EUR 0.90 (plus postage) so I summa summarumf for about 15 euros now possess a high quality soap holder.