[T.G]

I've always used either a dry or just barely moistened paper towel. Just enough moisture to pick up stuff on the surface, but not enough moisture to make the capa (wrapper) of the cigar wet or even damp.

Don't press down too hard, the capa is fragile and can be easily damaged. Also, always wipe toward the foot as wiping towards the head could cause you to catch a section of the capa where it overlaps and result in a tear.

If the mold isn't severe, you can sometimes also just wipe it off with your finger.