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dont do drugs!
The above makes little sense. Why would WikiAnswers have an entire section for this type of question, if not to have people ask questions like it?
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y would u want to do that?????
The most effective method involves the use of cold solvent extraction technology. Essentially you would place the material in a stainless vessel, vaccum out all the air, flood the vessel with liquid propane and N2. The THC will be bound and captured in the slurry. Once you create the chemical process for the the propane to change phases the target constiuant remains isolated for harvesting.
I don't really think there is a way to "cleanse" marijuana, but I've heard of steaming it before and it seems similar to along those lines.