Be careful with rust removers, most will remove the blue finish also. Navel jelly is an excellent rust remover but takes the blue finish with it. Blueing is a type of rusting process, it is not red rust , but is referred to as " rust blueing " so if a product removes one chances are it will remove the other. Try it on a hidden spot first.
I have sucessfully treated lightly rusted areas with a week long soak in kerosene and rubbing it lightly with edge of a real copper penny or 0000 bronze wool, untill the rust has been lifted. I don't know why , but the kerosene treatment seems to neutralize the rusted metal and keeps it from rusting again. Discovered this when kids left some channel locks out in the yard for a couple months, kerosene soak and bronze wool removed all the rust and no rust has returned