Fresh air, or the caravan owners' trick:
make small bags from old bed linnen. Get scented cat litter (...unused...), fill old coffee grinder with it, grind. Fill the bags. Keep in locker, bed, anywhere... /forums/images/graemlins/crazy.gif
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Febreeze 'em and leave in the sun for an hour or so should do the trick. Repeat as necessary...
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Agree .... my boat was left for ages between visits and Febreeze ... actually Supermarkets Own Brand !! did the trick.
Used to give a spray round after boat use and before closing up. On return few months later - boat was still fresh ! light spray to freshen up more and bobs proverbial.
If you have possibility to have all out in the sun ... especially if a bit of a breeze ... then even better.