I had quite a bit of rust inside since I didn't cap my vent until last month. I know - I am an idiot. So I took it all apart and used steal wool to get most the rust off and repainted everything. I did not know that the paint had to be cured. I won't post photos since I hate the paint job. I painted the inside black which was the only high temp paint I could find without going to the dealer and paying $10 more a can for brown. I guess I can live with it for now. Still have to pull the blower motor and clean that for the season.