I use warm water and a very
I use warm water and a very tiny amount of dish soap. After I am sure it is clean, I wipe it down with rubbing alcohol and let it sit to dry before putting it in the kiln. I had trouble early on with not getting the glass completely dry. I ended up with some pretty neat "mistakes". I am not certain what devitrification is. I am also a lampworker and tend to spend most of my free time doing that. I haven’t fused in quite a while.