...and/or wash new ones before use? I'm wondering about the child-proof caps. And, for that matter, same with the polycone caps I use on my glass bottles. I don't want to wash them with soap or anything because I'm afraid I could never be sure I've rinsed them clean. No matter how much I shake, rattle, and roll them around, there always seems to be a good deal of liquid remaining inside. What I've done in the past is rinse them with hot water from the tap, then soaked in ISO or PGA alcohol and left to air-dry. The alcohol evaporates clean, and faster than water would, but in that enclosed environment it still takes an awfully long time; I leave the plastic child-proof caps out generally overnight, and when I cannot shake a single drop out of them I consider them dry, but when the polycones get some liquid inside, it can take them like a week to dry up. How do you guys do it, is there an easier way?