I used candles as well for a number of years, but I finally tired of their continual melting and the resultant mess. This was in Arizona, where the pack often spent time in a vehicle. My preference now is for hand snaitizer (alcohol), which seems to work pretty well in warm to cool conditions. It probably isn't too good in very cold weather.

Ambient temperatures clearly are rather critical is determining the best, and most convenient, scheme to employ.