You can boil it in water, a soak beforehand doesn't hurt... you can keep any resin that boils off, just filter out the water through coffee filter or the likes.
or you can use pour salt and rubbing alcohol into it... they form a chemical reaction and the salt agitates any resin stuck to the sides, but you cannot reuse the resin when you do it this way (but it won't smell as much)
have you ever smoked resin? it is a wacky high because all the different types of bud you smoked will create a hundred different types of highness... i know lots of people who don't like it at all, but I always boil it out and smoke the resin (which is pretty potent as it is basically same process used to make hash):thumbsup:
good luck...you'll be amazed to see through your bowl again, especially if it has changed colors.
(pics would be neat if you could post some)