Although we highly recommend not reusing the jars -at lest not for candle use, I can tell you that if you would like to reuse the jar for storage here is how you clean the jar perfectly each and every time:
1. Use a hairdryer on the out side of the jar to release the wax from the glass. Remove as much wax as possible.
2. Wash with very warm water and soap.
3 Take a paper towel and rubbing alcohol to remove the remaining wax film from the jar.