Old marks on nitro

[archiestone]

Not sure it's Sharpie, but could be.
I bought a nice Guild acoustic with a couple of black marks on the end & back (thankfully not on top.)
A preliminary buff with a damp cloth made no diff whatsoever. Looks to be baked in, must have happened a while ago.
Anyone have success removing or minimizing black blemishes like grease, Sharpie, oil, etc. from a nitro finish and if so what did you use?
A pic --
http://www.fenderforum.com/userphotos/index.html?recid=51330

 

[FNG]

Try some Meguiars Scratch X. At your local auto parts store.

 

[The Guilds of Grot]

Try a little naphtha (lighter fluid) and some elbow grease.

 

[Guildmark]

See my Guilds at;
http://www.guildsofgrot.com

Onward to 100!

Keep hammering away!