Vinegar is a a mild acid that's good for cleaning and carrying other things you might want to distribute.

Clove oil is quite effective at killing mold at very low doses. It's also got a number of other useful properties.

They are, and we've found them effective (thankfully my area in Brisbane has been mostly dry this past month, so we seem to have it under control). They've been so popular they were selling out of the supermarkets for a little while; when the rain was dogscatting down some wag on reddit asked what we rename 'The Sunshine State' and my suggestion of 'The Vinegar and Clove Oil State' was universally well received.