The Planted Tank Forum - View Single Post - Suction Cups Stiffening
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Old 02-06-2013, 02:20 AM   #6
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I find that boiling almost always works. If not, it usually means that the suction cup has some film or the glass has something on it. I will bleach and scrub the suction cup and clean that part of the glass with a credit card, even if I have cleaned it with a scrubber already. Usually if you do those three things, you can get them to work like new.
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