A GOOD tip I heard about, maybe even on here is to use the silica packs in your boxes. Silica packs are the little packs you get in big bags of beef jerky and sometimes electronics. At my work we get shipments from over seas and they have 1/4lb silica bags that I keep in each comartment of my boat. They won't get rid of the rust but sure will prevent it. Since I've been doing this...no rust.