Get some "Goof Off" or a similar orange based solvent. Works well on those
pressure sensitive adhesives.

Dean

"Bill Stock" wrote in message
...
I stuck an LCD thermometer on my Betta tank, but it was a dud. I should
have realized when it did not "light up" that it was a dud, but I've never
had one of these on a an aquarium before. So I purchased a replacement and
tried to remove the old one. Well the outside layer peeled off and the
black numbers stayed stuck on the glass.

Any easy non toxic ways to get this off, razor blade, ice cube?

TIA