Hmmm really? We have suction cap shelves in our shower and never had a problem with them falling. I take them off (unscrew and unsuction) everytime I clean the shower and I clean the suction caps and screw/suction them back on, maybe this is the reason they stay stuck?
There is this awesome brand (i will go upstairs later and look but I'm having problems walking at the moment due to medication), you buy it at bunnings. It is white and it has this red circle in the centre, and this white push button over the top, you push the button really hard until you don't see any red, and then it stays no matter what. I couldn't get any suction things to ever stay, but I have 2 of these holding up a bag of like 25kg of baths toys and it never comes undone.
I think they also make ones with the hair dryer barrel holder.
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