yeah, what i do is put salt and acetone in a plastic bag with the pipe, mainly seal the bag but allow for a bit of steam to come out so don't seal it entirely, microwave it for 10 seconds or so. it's going to be hot, so get a oven mit and shake it up, if i doesn't immedietaly come of, use a paper clip, q-tip w/o the cotton, or a pipe cleaner to wipe off any remainder. and that's it, it'll come clean off if it's hot and softens up. you can also boil it in water, but usually that's smelly but yours is pretty clean so it won't be bad