Pam,
Now you need to get some metal polishing compound and get with the polishing. I've had the same thing happen when I've left stuff in Evapo-Rust too long. I've never gotten it to shine like it did when new. The Evapo-Rust will pit some metal and of course the rust it removes leaves pits too.
Evapo-Rust will will also remove plating if the part is left in too long. I have a stop motion knob that's losing it's plating because I forgot and left it in too long.
Joe