Add to 2 tsp. of mild dish-washing liquid to a bowl. Mix in 1 cup of warm water.
Dip a soft, lint-free cleaning cloth into the soapy solution. Dab the stain on the silk pillow with the cloth until the spot is damp but not soaked.
Dampen a new cleaning cloth with warm water. Blot the stain with the cloth until it lifts from the pillow. Wet the cloth with cool water. Blot the stain with the cloth to remove soapy residue.
Blot the wet spot with a dry cleaning cloth. Hang pillows on a clothesline to air-dry.