awsome cleaner. it works on everything and best of all it's only one dollar. they sell it at the dollar store or dollar general. it's called awsome. ten bottles for ten bucks, last you all summer. cant go wrong.
My power idles leaner than most efi boats.. If its that bad running install EGT gauges and correct the fuel curve. Pick up some power save fuel and it should help with a lot less carbon on the transum.