Those scuff plates are made from very soft aluminum.  They bend very easily. All you have to do is bump one with your foot getting out and it will dent or nick.  Even installation can easily bend them.  I would get new one and start over. 

I've gone thru a half dozen thru the years.  And they are pretty cheap.

Upon reflection - Don't bother to get new.  It will look like the old one in no time.

Thanks for the responses.It sounds like if I want something half decent, I need to go with the stainless steel ones? I saw those advertised and wondered how good the stainless was. I find that stainless is not what it used to be.
 

I have a one HP power buffing machine that I initially used to take off the anodized finish.
One coarse buff wheel was used with a black compound and then the other softer buff with an automotive rubbing compound brought the lustre to look like chrome.
Autosol in a tube is perfect for removing the scuff marks from dragging size 14’s over the sill.
I use the same method on other billet aluminum parts as well.
Another good polishing compound in a tube is Simichrome, I used
it on British motorcycle exhaust pipes that always tuned blue.