Mix mild dish soap and cold water in a bowl or bucket. Add enough soap so the water becomes sudsy when agitated.
Dip a clean cloth into the soap solution and rub the stain with moderate pressure. Make a circular motion around the stain and continue to rub until the stain is gone. Use multiple applications of the soap solution if necessary.
Air dry the the wet spot. A hair dryer or fan may be used to shorten the process. Do not sun dry the leather; this causes more damage.
Spray aerosol hairspray directly onto the stain. Make sure the entire stain is covered and allow the hair spray to soak in the stain for several minutes.
Rub out the stain with a clean cloth rag. Use circular motions until the stain is lifted. Add more hairspray if necessary.
Air dry the wet spot by leaving the leather undisturbed. Do not leave the leather exposed to the sun during the drying process.