wrote in :

Standard boat odor. Not diesel, not bilge rot, etc. Just 25 years of
"stuff". No perfume or ozone answers need apply.
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Replacing all the cushions and mattresses with new did wonders, here. I
think there were "things" growing in the seat cushions from years at sea.

You can test it. Take off all these things and air out the boat very well
to get rid of the residuals. Close the boat up and see if it's appreciably
better days later. If so, new cushions...not just washed which doesn't
work.

I also think a lot could be done by simply WASHING all the bulkheads and
overheads with an anti-fungal soap and fresh water. Do you regularly wash
the wood? Wood grows algae, even painted. I think you're smelling algae
and fungus growing inside the swamp every boat always is. Wood's
pretty...plastic doesn't grow algae and fungus. It's a tradeoff.

(Behind those wooden panels, by the way, "something" is ALWAYS leaking from
the toerails....growing fungus/algae behind the panels as it rots away.

Take a look.