Hi Don,
That’s a new one for me. I’m not up on brass cleaners so I don’t know why that would happen. A guess would be that the stuff isn’t washing off and maybe the heat from the dryer has something to do with it…I’m probably completely wrong though. I’ll bet when you start using that new Ultra Sonic with a commercial cleaner you won’t have that problem again. 
I wish I could help on this one but I’m drawing a blank here. Maybe others up here have run into this and can help out. Anyone??
Bob
