Careful with some brake cleaners. Some won't hurt finishes, but I had Rural King's store brand take the original finish off a GL1000 front cover a couple months back. As far as the origin of the leak, it looks like it is just dripping from the lowest points of either side of the bike so it could be coming from anywhere. Like someone said earlier the way the stains are dark in the center and clear but wet at the outside make me think fuel leak, like a possible fuel leak out the carb drain tubes and then the fuel runs along the underside of the engine and picks up a little dirt along the way.
