I just got a Yamaha f60 2008. When flushing it, is hooking the hose up to the hose tube and letting it flush with the motor off for 15 minutes enough? Or should I go buy some muffs and use those to be able to start it? Also, can I use turtle wax on it, or should I go buy a marine wax? What is the least water pressure I can run it at without damaging it by jacking the jackplate up?