Removal of scotch tape?

[busdriver]

I hope this isn't to trivial.
What can I use to remove the glue from the inside of the aquarium left from scotch tape?
It's about a quarter of the way from the top of the tank.

Vinegar or something else?

[artw]

Vinegar and a razor blade works for me.

[Saltcreep]

If it's just regular Scotch tape, plain old water will soften the adhesive.