Majority of carbon bikes have the same paint as found on ferrous/alloy. Generally its clear coat urathane. So you can polish it with the same compounds as used on cars....like the meguiars stuff.
http://www.meguiarsdirect.com/product_detail.asp?T1=MEG+G10307
If the scratches are deep enough to ketch a finger nail, just consider it part of battle scars to be proud of.
http://www.meguiarsdirect.com/product_detail.asp?T1=MEG+G10307
If the scratches are deep enough to ketch a finger nail, just consider it part of battle scars to be proud of.