How can I get rust streaks off of hard, formed plastic?

I detail cleaned the driver’s / passenger section of our 20 year old RV today. Up front it’s pretty basic. No pretty wall paper, just the off white, hard shell form.
A couple of the screws on the inside lost the plug that goes over them, and those two screws have leaked rust streaks and I’m not sure how to remove it. Comet? Baking soda? Mr. Clean scrub away pads (which I don’t normally use because my hands react)?