Not sure if you have ever been in the same situation with a lot of time in your hands... So got tired of looking at the surface rust on the wonderful smog system my California Spider has... So I decided to take it apart and remove the rust, Here are some picks.
I also did the throttle linkage and the spark plug wire brakets...
I submerged the pieces In a container with white vinegar and let it go overnight, then I used my drill with a soft wire brush and remove all the rust (some pieces show texture where the rust had penetrated), then spray generously with WD40 immediately after grinding to protect the pieces from rusting and dry up with a clean dry towel.
Depending of the piece if you want to show them even more, use sand paper starting from 200 up to 1500 grit for a polish finish, once after sanding, finish with a red and white polishing compound stick and buff it with the cloth polish wheel.
Just a note, be really carefull with the vinegar once it's worked it becomes rust color and it's known to irritate the skin so, do not pick up the pieces with your bare hands, use some pliers.
All this is very time consuming but the regward of restoring each piece is priceless for me!
I cleaned up the factory fan using a different method. It came out nice and shiny. But I then sprayed it with an automotive clear paint. It also looked very nice when complete.