Step 1: Use a hair dryer
Use a hair dryer to heat the candle jar and clean it with paper towels. But pay attention to the temperature of the jar and don't get burned.
Step 2: Use household disinfectant alcohol
Use household disinfectant alcohol while the jar is still warm. If you don’t have household disinfectant alcohol, you can skip this step. But after step 3, may still have little scents.
Step 3: Use Soap
Use Soap to clean candle jars. If there are still some scents, you can soak the jar in water for a few hours or a day.