[almostdone]

What was the item signed?

I know how to easily remove sharpie from a glossy photo. Carefully cover the sharpie ink with ink from a dry erase marker then take a dry paper towel and gently wipe away. The sharpie ink is more attracted to the dry erase ink than the photo so it removes easily.

If you do try this, practice. Take a photo you don't care about, write on it with sharpie, let it dry then try the above method.

I'm not sure how, if any, on any other medium.
Drew