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Hello Ray,
I believe your, "staining" to be stains from the boat being left in the water for an extended period at one point. You can use or pay for a marina to lift your boat off the trailer on jack stands or Styrofoam blocks and spray the hull with muriatic acid and the stains should disappear. This will work much better as buffing will not get rid of water or algae staining but the acid will. if it does not come off with this treatment then you can try to buff and wax. I leave my Whaler in Lake Michigan each season with no bottom paint and it looks brand new after using the acid. Then just rinse with water and then re wax the hull. The acid will not harm fiberglass plastic or blacktop driveways. It will damage, however concrete driveways and painted or galvanized trailers. That is the reason for the jack stands or Styrofoam blocks.

Jim G.