I bought a 346 one time that was leaking bar oil, no problem, seen that before. Then as I wiped it down I realized it was leaking from between the cases, most likely it had been pressure washed, not sure how else you could do that with vacuum alone since the gasket was inside the case lol.I have an air booster. With a water line to give it some mass 300 psi with a lil water really cuts the crud without a full sized pressure washer.