STOP!
Never ever use rubbing alcohol, or any other solvent on your cigars!
First of all, is it white mold? If so, you do not have to wipe it off, whiping it away does not stop the infestion. The only way to do that is to keep the relative humidity down! It is not dangerous to smoke cigars with white mold and it seldom affects the taste (actually some people, me included, claim that it seems that some mold could be beneficial for the taste, this is not proven yet though!). If you however feel uncomfortable smoking a cigar with white mold you can gently wipe it off with a dry soft cloth or soft brush.
Remember that the visible part of the mold is a smaller part of its total mass. Most of it is inside the tobacco!
Lastly, is the mold green? Then it is unfortunately nothing to do but pitching the stick!
Edit:
Whiping the inside of the humidor with alcohol will not stop mold infestion either since spores of mold is everywhere in our environment! The only way is to keep the RH at reasonable levels, like 65-70 % that most cigar smokers prefer. Check your hygrometer!