I use suction cups for so many things and slime is the culprit.
As a side note, if you need/want suction cups, visit Dollar Tree. They have awesome clear cups in a 9 pack! They have two kinds, the usual ones with metal hooks, pass on those. The good ones have a plastic hook. Slide the plastic hook out, toss it, and you have 9 great cups with holes already in them for a buck.