Are you looking for a degreaser or something to "dress them up"?
There is a environmentally friendly degreaser called Detailers Pro.
I am not aware of a marine specific product to dress up the engine. I would think that maybe a product used on motor cycles would work? Like S100? Maybe a "go-fast" forum would have some info on that.
Phil, Vicky, Ashleigh & Sydney
Life is short, boats are cool.