Remove stains, such as those from a ballpoint pen from a leather jacket using a cotton ball saturated in rubbing alcohol. Spot test the alcohol on the leather first, then apply it directly to the ink. Allow it to sit for about 10 minutes, and then scrub gently with the cotton ball to remove the ink. Blot the ink with clean paper towels as it dissolves.
Remove oil stains from a leather jacket by spreading an absorbent material, such as corn starch or talcum powder over the spot. Allow the material to sit for several hours to draw the oil or grease out of the leather. Brush away the powder once the stain is gone.
If there is a water stain on the leather, use more water to remove it. Fill a bowl with warm water, and use a new sponge to wet the entire section of the jacket to the nearest seam. Once the leather is wet, allow it to dry uniformly and the water mark should disappear.
Successful removal of most leather stains requires immediate action upon discovering the stain. As stains set in the material, they become more difficult to remove. If attempts at removing the stain at home are unsuccessful, a professional leather cleaning company may be able to remove them.