I bought a Hoch mold where someone had sprayed it with some kind of release stuff, who know how long ago. I tried everything, acetone, lacquer thinner, oven cleaner, nothing would touch it. I ended up using a worn bronze bore brush and Flitz. I scrubbed the vent lines clean then closed the mold over the brush with Flitz inside. But I didn't turn it because the bristles would jump over the grooves. So I just grabbed it with vice grips and went back and forth, maybe half a turn each way. Came out great! Cleaned to crap out of it and it throws a great bullet now.
