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I use the spray-on hull cleaner from Academy Sports(Texas). You spray it on and then wash it down with water. I've never seen anything else work as fast. I don't use it every time I clean the boat, only when it gets really bad. I also wax the hull a couple times a year to keep it looking good.

As for the harbor freight buffer, I agree that it is a screamer!! I"ve never heard a buffer sound that bad. I'd pay the extra $50 and go with a Makita before I bought another one from Harbor Freight.