A lot of people i know have that sicky cold and have been fighting it for weeks...some even on pretty heavy duty antibiotics! It sounds wacky, but there's this old remedy where you just slice a big onion (the cheap ones) and put it in the room where you sleep. It's supposed to remove toxins and it helped me, i think! Even if it was just a placebo effect, success is success
Anyway, i don't know about a PC, but you may have luck removing the rust with a toothbrush and whitening toothpaste. Worked wonders on rusty stuff (and ponies) around my house!