I'm sure this has been ask before, but I was unable to find any refers to this problem in bulletin board archive, so here's my challenge. I have a small water stain on my desk. It appears this was caused by friction from a seam on my car rack strap scuffed away the varnish and epoxy. Unfortunately, I didn't notice the problem until the stain appeared. Before I attempt to re-epoxy and varnish the area I would like to remove the stain if possible. I'm concerned about using a mechanical method, other words I'm concerned about sanding the area too much. Does anyone have a trick for removing dark water marks in wood? Thanks

Dan