Hi there,<br /><br />my 90 HP OMC engine is quite "dirty", grease, oil and mixtures of fuel/sand etc, I would like to clean it with some sort of cleaning spray and hose it down. My neighbour fears I would do more bad than good, as the grease and oil propably protects that all girl better and I could get cleaning solution and water in places there they should not be ???.<br /><br />Any opinions or alternate methods would be appreciated.<br /><br />Thank you