I'll always recommend the amazing doctor zymes. It's an all-in-one fungicide/pesticide that rocks socks.
If you're looking to make something at home, take a splash of Castile oil (I use peppermint), a gallon of water, and a couple tablespoons of potassium bicarbonate. It will take mildews and molds right out.
Here's a link for a free sample of Dr. Zymes, you just have to pay a few bucks for shipping:
www.doctorzymes.com/wizard
I hope this helps.