I clean my V-tower bags, elbows, tubes, mouthpieces with a little 91% alcohol and Q-tips( get the all natural ones from a healthfood store if possible), then I tear the ends off of the Q-tips and throw the THC soaked cotton under a cool fan or hair dryer for about 30 mins. Once I can't smell alcohol anymore I throw the little dirty orange swab ends into the Vape at 215-220 C and that shit hits you like a ton of bricks. One small bowl fries me and my buddies a couple times.
Sounds crackheadinsh I know, but I have made a lot of hash and hash oil so it only seemed practical to me.