How do you remove stuck down foam layer on a shadow box?

Question

I bought a shadow box, thinking it just had a black background, which is what I wanted. Well, I went to use it and it's squishy and is used to velcro things to. I don't want to do that with it. So, I removed the "squishy" part and am left with a thin layer of foam that is glued down. I got some of that off, but it's glued down pretty well. How can I remove it??

What I'm trying to remove it from is sort of a picture frame back type thing.

Thanks!

Answer 1

There is a product called Goof Off, it will help you clean off the rest.