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How to get butter out of clothing
Rub dishwashing soap into the stain.
Because dishwashing soaps are designed to deal with the fatty, greasy food products that build up on pots, pans, and plates, they're also a good way to deal with butter when it gets on clothing.
Dampen the stained area with lukewarm water.
Apply a small amount of dishwashing soap to the stain. Rub at the stain gently with your fingers, making sure to spread the soap throughout the stained fabric.