I had completely forgotten to mention also sour milk (or fresh or powdered milk) is also an anti-fungal.
I remembered this when I opened my fridge today and noticed the leftover milk from making yogurt with (if you want the simple, super awesome recipe just ask! It's so easy and magic) had gone bad.
Did a little research and found a nice little science for backup. (note especially the 30% dilution mention)
Also having slipped my memory (as I don't have to deal with problem often, and once you find one thing that works you sort of stick with it) is that chamomile tea, garlic solutions, and cinnamon solutions (or powder) are also an purported method of mold/mildew prevention/treatment.
So, cuppa chamomile-garlic-cinnamon-milk tea anyone? (I'm sort of seriously thinking of doing this)
This fact made me whip up a dust of powdered milk, ground cinnamon and garlic powder (NOT SALT) which I sprinkled at the base of my house plants in hope that it will drive away any pests.
This would be interesting to use in a solution as long as you filter it ahead... gunked up sprayers are no fun.
Other helpful links: