hey guys, i've had a phunnel bowl for like 2 years now and now i have this carbon line that is so thick that it makes everything i smoke taste like double apple.
i've done the sos pad with lemon juice and vinegar, and in the past when i've cleaned my bowls in a p.o.t. of boiling water, it would get rid of the line but i've tried 3 times with baking soda for 45 minutes and i cant get this carbo line off. i don't want to drop $20 on a new bowl.
any suggestions? i'm thinking sandpaper or a dremel with the sandpaper attachment or like a stone/wire attachment. (see below)