I got rusty water spots on my light pink/green quilt (was a gift as well). Made a paste out of oxy. One spot came out great first treament. The big one took 3 treatments, buttttt all came out beautifully. Can't even tell it was there.
I love this stuff. I've never written a letter to any company, but if I did, it would be this one. Love Love
Good luck, hope it comes out :-D