Try a product called Corrosion-X;
https://www.corrosionx.com/products/corrosionx?variant=30930717966432. It is like magic. It works great at preventing corrosion and desolving it. One drop and about 5 minutes and your swivels will spin like new. I use it during reel maintanence too wiping everything down and a little drop on bearings. They also make a product called Reel-X that is specifically designed for bearings, while it also is an excellent product, regular Corrosion-X seems to work almost as well for everything. One drop on the end threads of a frozen lug nut, 10 minutes later you can literally spin the nut off. The stuff really is magic.
It has replaced WD40 on my bench, great stuff.