I have vaped many of the vapeable cathinones since the days of MDPV and a-PVP, and always had some trouble with this, even with hex or nep, most recent of choice being a-PiHP.

The best way I have come to clean them is to soak in warm/hot water with sodium-hydroxide (careful not to make explode lol ) and then after some time (a day approximately), I rinse with vinegar, then wash out with normal washing liquid and finally a LOT of rinsing with clean water.

If still some residue, then I burn off with a blow torch.

Does anyone have a better method to clean class bowls of the residue?? I would like to know...