How can plastic get stuck in the glass?
Acetone, ditto. Less and thoroughly, and best of all, it removes the residual gum very quickly and easily. It is better than alcohol.
With paper towels stained with some alcohol (preferably industrial alcohol, not to use medical also OK) wipe, and then rub a few times on the clean.
Blow it for a while with a blower. After heating, the glue melts. It can be easily removed. If there are some traces of go away, can use Fengyoujing smear, will remove the relatively clean.
