Fill the empty peanut butter jar halfway full with hot water.
Add several squirts of liquid dish soap to the jar. Use dish soap designed to cut grease.
Screw the lid back onto the jar.
Shake the jar to distribute the water and soap solution to the entire interior of the jar.
Let the jar set overnight, shaking the jar several times during the evening.
Rinse the jar out in the morning and wipe down the interior with paper towel.
Things You Will Need
- Liquid dish soap
- Paper towel
- Instead of liquid soap you can use white vinegar.