Review on LUXEAR Waterproof Restroom Bathroom Removable: The Ultimate Solution for a Dry and Hassle-Free Bathroom Experience by Bud Crabtree

I keep two of these in the shower to thread a cord between to dry the shower curtain by holding it to the side of the tub (to avoid mold). These two also hold if I stretch the cable properly. Even more impressive is that I installed one on my laundry room door that is made out of painted wood. For a few days he has been holding on to a tree with a pair of shirts on wooden hangers. I don't think it will come loose unless I want to take it off. You need to press hard and wiggle/twist the center a little so it seals regardless of the surface. They come with plastic suction cups and without these caps I would expect the suction cup to collect dust. They may need to be cleaned if removed after a long period of time.