I'm swapping a loader from a Power King tractor that I bought, to the Power King I already own, and spending some time replacing hoses and assessing fittings as I go. The donor tractor sat outside so many things have a rusty patina. I started cleaning up some of the fittings with the wire wheel on my bench grinder. With all the humidity we had recently (~48 hrs. of rain here in Michigan), I noticed some minor surface rust starting on the fittings I had cleaned.
I'm sure these were zinc plated, so between the rust and my wire wheel, that plating is gone. Any recommendations on how to keep these fittings looking good? I'm considering a periodic wipe with a light oil (e.g., mineral oil or WD-40), or something like a silicone spray that will protect then be dry.
The ultimate solution is to replace the fittings with new, but trying to avoid that.