When I first uppacked my Rebel I had just received back from SBD, I knocked it over and it hit a metal chair. I almost cried as I noticed a mark on the top tube. I wiped it, rubbed it but still it wouldnt shift.
I then decided to get the autosol abrasive polish out and very lightly polished out the mark. It completely disappeared, couldnt believe my eyes.
One of the benefits of powder I suppose, being so durable.
But it did also leave a nice shine on the frame afterwards. Just be carefull not to rub too hard.