Blot the butter stain with a paper towel until the paper towel will no longer absorbs moisture from the stain.
Dampen a washcloth with cold water and apply a few drops of hand soap to the cloth. Work the soap into a lather. Rinse the soap lightly and wring out any excess water.
Blot the stain with the damp washcloth, then blot the moisture from the soap and water with a dry washcloth.
Allow the stain to dry. Repeat the blotting process until the stain fades.
Apply a few drops of vegetable oil to a clean washcloth. Rub the cloth gently over the area that got wet during the cleaning process. Blot any excess oil from the leather with a clean cloth.