Stop in for a cup of coffee

64 AAR Valiant said
A mixture of dry ice and AL key haul
Works. Spray blast. If you have a rotisserie you can pack it in dry ice and wait at 10, 15 minutes and hit it with a hammer.

I tried WD-40 and that helped and better than heat that seemed to smear it around and soften it up to much.
But I'm no expert on it.