Is there a way to flush a mag 350 after use when the boat is in the water? I'd like to be able to flush the block . I know I can't flush the manifolds or risers or the drive. Mercury told me that they no longer make a flush kit and the sea ray dealer told me if I install one it will void the waranty. It's a new boat and I haven't taken delivery yet. I do boat in the salt waters of NY... Thanks