For the hoops:
Clean them. Dry towel, followed by moist towel followed by dry towel.
Remove pits and rust. Water + Aluminum foil followed by a dry towel.
Protect them. Add a surface barrier. Whether it be wax, a poly mist, grease, whatever. You need a barrier between the air and the steel.
The steel hardware.
Clean them. Dry towel, followed by moist towel followed by dry towel.
Remove the rust. WD40 is fine for a tiny amount of surface rust. If the rust is significant, you will need vinegar/baking-soda/water baths.
Protect them. Add a surface barrier.