"Environmentaly Friendly" Huh? How mush oil are you going to spill all over the place cleaning this? What are you going to do with the stuff afterwards? The only thing that will really clean it is gasoline, and you don't want that on you skin.

I remember a friend bought a used Ford Pinto back in the late 70's. It came with an auxilliary out board oil filter on the inner fender. It tapped into the oil sending unit and then back to the engine by a fitting on the oil pan. Now get this, it used a roll of toilet paper as a filter! Laugh your A$$ off, but, even at the 3000 mile point that oil right out of the crank case was sparkling clean.

 

Don't forget to wash the filter in your local pond or Lake

Oh and make sure to pick up one of these if you order that:
http://www.autobarn.net/torfuelsav1.html