Need Help With Mildew

[nslinkman]

I just got back from out of the Country for almost a year. My bus was stored in
a garage with out heat. I noticed that someone had closed all the windows in the
coach. What I found was a brown residue on a lot of the walls and cabinets. It
looked like someone had shaken up a Coke and shot it over the walls. I assume
this must be some type of mildew. I never saw mildew that was brown. Does anyone
know what to use to remove this mold and why this happened. Any help will be
appreciated. The best part the bus started right away.
Thanks
Nelson 1994 40' Pusher