I pulled out a box of 505gr minie's that I had cast some years ago. Now they are totally white with oxide. Question is... should I try to clean them, or just shoot them as they are? I won't put them in the tumbler because it would most likely damage the skirts. I thought there might be something that dissolves the dusty white oxide. The minie's are hard to cast so I don't want to melt them down and start over.