I live on the Gulf of Mexico now, before I lived in Michigan. The best thing I have found so far has been CRC's SP 400 and WD 40. But if you can find a space in a conditioned space that is the best, if not check your tools every month. I lost one router and a pad sander to rust, I have a few hand tools that are not in the best of shape due to rust, nearly 40 years in Michigan and never lost a tool to rust, two years on the coast and lose a bunch. It'seems funny they call Michigan the rust belt, go figure.