Technical how to remove dried thread locker?

I had some generic blue loc tight tip over and leak out in a tool box, when I found it, it had dried and bonded to a shotgun choke tube. I've tried a couple different solvents, break cleaner etc, and so far nothing has touched it, I don't want to use too hard of a gasket scraper or wire brush for fear of screwing up the threads. Anybody have any suggestions?

 

heat and a wire brush

 

heat

 

Tried MEK ?

 

Heat always works for me. If you can get it hot enough it will just wipe off

 

^^^^Yes Sir^^^^^

 

Thanks All! sounds like heat is a winner