Long ago I taped a photo to my kitchen window. I would like to remove it, but it is really stuck to the glass.
Some of it came off but much of it remains stuck to the glass.
I tried hot towels against the remaining portions but that does not work.
Please, do you have any suggestions?
Thank you.

Try nail polish remover.

Try baby oil.

Use WD40. Will loosen glue and can scrape off with a paint scraper.

After wash with window washer.

Chuck

Goo-Gone, one of the librarian's best tools besides 3M book tape.