Citristrip works also on tumblers. Put it in a zip lock bag, cover tumbler in a thin coat of Citristrip, seal zip lock bag, come back in an hour and it will be clean. Just put on gloves, pull out of bag, and use paper towels to wipe all the goop off of the tumbler. If you happen to have a spot or two left on the tumbler that wasn't fully covered in Citristrip, you can spot clean with 100% acetone finger nail polish remover.
Does this work on Magpul MOE furniture too? I bought some discounted bubba Mossy Oak Brush and A-TAC color Magpul hand guards that would not dye with Rite dye. I don't want to melt them either with harsh chemicals. Or if it works the same way.
I have the same problem trying to get them off some 12s they came off with medium bristle and stiff bristle brushes with a lot of elbow grease trying to find an easier way