How Much Propylene Glycol

[Wharf Rat]

Well, the trick with bleach is to get rid of all of it, unless you want to smoke it. So, at a minimum, I'd put it in the hot sun for a long time.

However, if sterilization is your goal, I would think about using alcohol, which evaporates easier. You can get 90% isopropyl alcohol in the drug aisle for a couple of bucks.