Annie,

You could attempt to soften it with some basic cleaning chemicals, I used denatured alcohol,mostly, but paint thinner, goo gone, etc. should work as well.

You would also need to get your hands on a "plastic" putty knife or scraper, so you don't scratch the paint off the cavity,and remove as best possible.

That's about the best you can do at this point.

Good Luck,

:) :) :)