Soap dish for bonding without adhesive

I needed a soap dish that is to be mounted on the tiles without drilling and came across the soap dish of Wenko. The installation went Rip-Rip. Remove protective film from the adhesive surface, pressing against the wall, finished. The shell itself is the holder chrome from simple plastic.

After the first bath of my children (2 + 5 years) I have cursed. Even that was the whole thing down here and I'm sure that it will probably not hold back. After the adhesive surface but was clean and dry, the thing again stuck to the tiles. Since the investment has been worthwhile then.

The Gag: The adhesive surface does not stick - that's why you can remove the peel and leaves no sticky residue. How this will work out that keeps the tiles, I can not explain, but it works.

Conclusion: Opens, maintains, but rather expensive with 8.89.
Therefore 1 star deduction.