i just bought a proline w/ a outboard merc 250 efi. can anyone tell me the right way to flush out after using it. i have been hooking a garden hose to the flushing port and running at idle with the lower unit under water. is this correct? the motor is 1 year old and previous owner never flushed, anything special i should do because of this. also is there anything else i should be doing. can you please be specific this is my first boat. someone also said i should flush the intakes. i do not know anything about that.<br />thank you very much 