I have sanded many scratches out of my boats. I start with 2000 grit and start sanding. Wipe it with a wet rag to see how much progress you have made. I then use a hand held drill with a a 3M 3" buffing wheel. I use Meguiars Mirro Glaze Diamond Cut 2.0 to bring back the shine, then top it off with some Mequiars cleaner wax, all while using the buffing pad on the drill.
don't be shy :-)
2007 X2 - Current
2004 X10 -Sold
1997 ProStar 190 - Sold
1993 ProStar 190 Star & Stripes - Sold