Mars
I have some of the gray scotchbrite used by a local autobody shop for sanding between coats of the same color.
I would think the Scotchbrite is a bit "TOO" abrasive for this. I have never worked with it so I"m not sure but,I feel it would leave unwanted scratches/ gouge's in your paint.
Maybe try sandpaper. A fine grit 2000 to 6000 grit .
Just my 2 cent's worth..... other's with more knowledge will be able to help more than me.