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Many boats are plumbed so the head sink outlet and head water intake is a shared thru hull. If so, close the thruhull, and all the sink water must pump through the head. It''s fresh water and will eliminate 95% of the odors. Another solution is to use the shower wand to direct fresh water into the head, close the intake valve and flush with fresh water.
Make sure the hoses have no low spots which will hold liquid.