the best thing i have heard of is like 80% or higher rubbing alcohol, just set your pipe in a tub, and totally submerge the thing in rubbing alcohol, or just the chanbers or the stem, whetever suits you. aftercsome time flys by, it should eat away the resin/nastyness... im not totally sure it works but i have had hundreds of people tell it works the best(well not that many people). then to sterilze it, fill it with boiling or very hot water, but if your cleaning a glass pipe, and its still hot from the boiling water, dont pour cold water on it or put it in the fridge/freezer to cool it down, it could crack, just let it cool at room temperature till its not warm anymore.