Cut a potato, rub the juice on the suction cup. This really does
work. I don't know why.
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No, a suction cup works by forcing air out of the space between
it and the surface it's on. No air = no suction.
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When you stick a suction cup on a window you force the air out
of the suction cup and you create a high pressure vaccume keeping
the suction cup on the window.
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because you are pushing air out of the space between the window and the suction cup