I'm sanding down the tiller as the previous finish had some cracks/peeling going on. Where the finish had come off there are black stains in the wood. I'm afraid sanding to eliminate these would take the wood down too far, and was wondering if one could bleach the wood somehow? Also, for gouges in the wood, is it best to sand them smooth; I don't see how one could match the color/grain with fillers. Pics show the black spots, as well as try to show a long gouge in the handle.