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wrote:
It's like a combination of smells - maybe mold and sewage (?), but not
rotten eggs or oil/engine smells. We can't find any specific "source".
The bilge smells ok, the head smells ok, etc. After the boat has been
closed up for a few hours, there is just a general stinky smell
throughout.

Had this problem on a Mirage 33 I crewed on. After a while I couldn't
stand to sit close to the dodger in the cockpit becuse the smells would
waffle up & make me feel sick...especially if the front hatch was open
to blow the air through. The boat is gone now...but I would guess the
old hoses were to blame. It did have a holding tank still 20% full...but
only a real thru-hull marine toilet had been used sparringly in the last
number of years. (still allowed on Canada's East Coast)
note: sailboat sold a couple of years ago.