I made sure my windows were absolutely clean and after the third time they fell out the window the same day I stopped using them. I didn't have much weight on them and one of them wasn't even holding anything. The suction cup part appears to be deformed because it was pressed into a small pouch instead of being attached to cardboard to keep its shape. The plastic hooks also look pretty cheap. There are definitely better products out there. I've used 3M products to hang sun catchers and Christmas decorations on windows and nothing has fallen!
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