ive searched every article i could find on this recently. Boiling gear is supposed to help cut down on the Benzyl alcohol (BA). Also you can bake it, some say it works, some say it doesnt. Pretty much the reason for doing this is to stop having painful injections.
The way to do it is to put a needle through the rubber stopper and into the free air in the top of the bottle for ventilation. Then boil water, hold the bottle in the boiling water for 5 to 10 minutes. Ive also heard of baking for 45 minutes at 250 degrees. I personally just tried it and didnt think much of it, now im just cutting my stuff with injection oil to kill the pain.