Starting to thouroughly clean my new S2000 and there are a few scuffs on the rear bumper. Im wondering how to remove these few marks. I'm not sure if this is something I should use a clay bar on or something like scratch x.

 

You will get a decent result by using some compound and then follow up with some polish. You might want to start with clay bar first.

 

 

Try a Mother's Speed Clay 2.0 and some detailing spray to lube. These things are amazing.

 

I recently removed two large scuffs off my Acura Integra by wet sanding, 2000 grit paper and soapy water worked perfect. Followed up with polish to restore the paint shine. I agree by starting with the least aggressive approach first, if they don't work then wet sand it as long as you are comfortable with the process.