I'm getting ready to do a home service, strip and clean and tighten or replace on my bike but a few areas on my Kinlon 200 dualsports are showing rust after less than a year, kept under cover, and 600 km ... oh well, rub it down, proof and paint ... except the brake discs, I don't want to oil/wax/paint them of course so what do I best use in this critical area please?