That's exactly what I do. I just did it to this Peterson Emerald 104. Just wet paper towels until it's clean. Now I'm smoking some Erinmore Flake.Usually hot water and little wads of paper towel. Scrunch up into a little ball, get hot water on it (not soaking or dripping), twist in the bowl a couple of times and repeat. I’ve used sandpaper sparingly for stain if there is a little at the top of the bowl, and if there is a bit of stubborn coating, but the paper towels usually do the trick. When they come out white instead of black you’re done!