Hey guys and gals got a question hoping someone could help with ..2004 stx 15f 200 hours had to replace stringer pipe and noticed some clogging on manifold ..doesent overheat ..my question is i read vinager can help clean jackets out ..when i dump vinager in the garden hose flushing port if i just pour the vinager in do i still run the engine ? Or with no real pressure is dumping while off ok ?