Butter transforms popcorn into an indulgent, delicious snack. The oils in butter also will leave stubborn stains on clothing. This can happen easily if your buttery fingers accidentally brush against your clothes or some of the popcorn falls onto your clothing. Most people find that regular washing won't remove popcorn butter from clothes. Luckily, there is a way to get rid of greasy stains resulting from popcorn butter.
Blot the butter stains with paper towels until you don't see any more oil on the paper towel.
Cover the stain with a light dusting of baking soda and rub it into the fabric gently to absorb excess oil.
Brush off the baking soda with a toothbrush.
Apply a laundry stain remover to the butter stain. Rub in the stain remover and let it sit for 15 minutes.
Wash the clothing according to its directions.