I had a pipe that sounds similar to yours. I used to use those little plastic caps that you get with cold medicine and put fingernail polish remover in them. Break down the pipe and let in soak in there for a few minutes then the stuff comes right of with paper towels and some q-tipâ??s. I always washed my pipe with soap and water after that because it makes your pipe all stinkyâ?¦.stinky but clean.