Naa,.........It's probably gold spray paint, just send it to me to get rid of!
I can't wait for Jens or Jim or Brian to comment on this one, as they are in a Much better position to say something constructive!
All I can say, is don't go too rash with cleaning, that rust took a long time to get there, and should take a long time to remove!
You could try oiling with Olive oil, as this seems to have a peculiar ability to soften and lift rust in a most gentle manner.
Please document all progress David.
Best wishes,
PB.