amor_fati wrote:SWIM's considering doing away with acetone altogether, since he no longer requires it for freebasing. Now he's searching for a nontoxic method of pipe cleaning. He's thinking vinegar (to facilitate recycling of any leftover product), followed by a sodium carbonate solution (to neutralize the vinegar), followed by water (to wash out any leftover salts or base), then scrubbing with a cotton swab and heating to eliminate moisture from the piece.
This process works quite well and SWIM will amend it to the tek soon. It's a little tougher than the use of a volatile solvent, but it's much less risky and worth the little bit of extra effort.