This is a test of commonsense. Complete the next sentence:

How to remove red wine stains from leather
See if the leather is finished or unfinished.
If the leather is naked or aniline, it has no protective treatment, and will need to be cleaned by a professional. Wet a paper towel, and let one drop of water fall onto the leather.
If it soaks into the leather instantly, do not attempt to clean it yourself. If it remains in a bead on the surface, however, the leather can withstand home treatment.