fuse panels and corrosion

And after cleaning/greasing........make sure connections are tight. Screws/clips/prongs etc.

Klutch,

My group of technicians did a lot of work on fancy and expensive boats for many years. That is over, but we learned a lot. One of the things we learned was to coat every exposed connection with silicon grease. You can buy silicon grease as "Di-electric" grease at auto parts and other stores. All greases are dielectric, but the silicon greases have zero film strength, so it won't interfere with contacts. While it let the contacts touch, it will also prevent incursion of corrosives and cover the exposed metal.

In this case, I would suggest you find some crocus cloth (extremely fine sanding cloth) and use it to polish what you can get to and then bed the fuses in a small glob of silicon grease. I do this on all the exterior lights of my own vehicles and never have to deal with them use a bulb (the few that remain) actually goes out.

Matt

Remove power, gently wire brush/clean everything, then use an electrical type grease on everything. Its like putting a piece of metal outside or in a damp area, you wont see rust on the oily/greasy metal.

When using crimp type connectors, (butt connectors, blue, red, yellow etc) I always put a little grease on the wire and in the terminal before crimping. It wont last forever but its far better than not protecting it. Put grease on before pushing terminals on.