Darn it, I scratched my Roland Now what

For some stupid reason I was cleaning one of the shelves of my stero rack and a I accidently hit the top of the shelf with my Roland gear causing a nice scratch on the top plate. ( black ) Thanfully it is not to the metal but more of a good rub mark. This is ( was ) an expensive piece of equipment. Any ideas on how I could possibly remove this dreadful mark.