I have installed three shelves in the corner of my shower stall using suction cups. The walls are ceramic tile. Two of the shelves are sticking just fine, but the third shelf has suction cups that just don’t want to stick. I wet the cups before installing. I thought I had a good suction going. But it’s not working. Anybody have any ideas how I can get the bad shelf to stick to the wall???
Check the cups to be sure they aren’t leaking or split. If not, try “wetting” them with vaseline, and see if that doesn’t help.