How to remove residue from a suction-cup thermometer?
I've been having some trouble with my thermometer. The suction cup is no longer doing its job and there is now some residue behind it. I have taken the thermometer off and am now using one of those sinking thermometers that stand up at the bottom of the tank.
How do I go about cleaning off this residue? It's really bugging me! It doesn't come off with just hot water + a sponge or a paper towel. I'm worried about using any soap or chemicals.
That happened to my Eclipse and thermometer too. I tried scrubbing it but didn't want to scratch the acrylic and I tried cleaning it with a little vinegar. But alas, nothing really worked. I just stuck a new thermometer on top of it and made myself thing the residue was part of the suction cup. I got used to it.