How to remove glue on Classics back labels?

[Archilog]

Hello HP fans,

I removed this afternoon a Classic back label I would like to store as flat as possible (maybe under some weight for a while...). I suppose it would be better to eliminate any glue residues, and do the same on the back of the calculator.

Any advice about the best chemical product I should use? Thanks in advance.

PS: I read this (https://www.hpmuseum.org/cgi-sys/cgiwrap...cgi?read=2) but this article didn't mention anything about that.