A soft lint free cloth (or we actually use Viva paper towel, but no other brand is usable) with a good quality guitar polish, and a little elbow grease. Our favorite polish right now is a product called Powerchord, which is made by a company called Bioterra (I am not sure about that spelling). They do not, however, have a website, nor can I find any web presence at all. Good stuff though, and I will try to post their number next time I am at the shop. The GHS polish is pretty good, as well. Don't use furniture polish, as they usually contain silicon, which can damage your finish.
If it goes beyond what you can get with a basic polish, we can usually buff things like that out, but you need to get that done professionally, as you probably don't have the equipment, and it is possible to burn through the finish as well.
Light
"Cowards can never be moral."
M.K. Gandhi
