What is the best cleaner to put in a lower unit to clean out all of the "milkshake" from a leak that allowed the grease/water mix to happen? I have replaced the vent/fill hole washers and want to test it (according to a great post I was turned on to on this board THANKS!!)<br />It is still on the motor and I want to put it in the vent hole and have it drain out. <br />Thank you,<br />Scott