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Wipe the wall down with bleach and keep the wall dry. Are you getting it wet when the cage is misted?
You should elevate your cage off the ground! Especially with that towel. Get a few pieces of 2x4 at lest to get some ventilation so the moisture doesn't stay too long. Mold is a hard thing to get rid of and breathing in the spores ext. can be seriously bad for your health.
It's the towel then. Looks like it should be set up fine though Is the towel touching the wall? If it gets bad your going to have to remove the drywall and patch it back up to get rid of the mold I would still stick a little something under the cage to get it off of a wood surface.
I have all mine inside...I tried the towel thing at first but got the same results as you...basically now I have them elevated off of plastic water pans (washing machine pan) and about 10 inches from the walls so that the carpet and walls do not get ruined. You are going to have to use some sort of pan because the water will eventually run down your cabinet and ruin the area your cabinet touches the ground. I would put a pan on your cabinet then elevate your cage off the pan.
-chris