Funny you should ask.
I had water seepage in the front passenger window, as the drain holes had clogged and the water came over the sliding window channel. The water soaked into the luan siding and ran inside the wall as far astern to almost the passenger door. Just yesterday I finished the repair: I scraped away the ruined luan, the sanded the rest to the Styrofoam inner wall. That was where the smell was. I also had to replace two wood stringers that had rotted.
I replaced the luan plywood with Allure vinyl planking (flooring, really) and glued into place. The we shampooed the carpet, and the smell has started to dissipate. It also looks pretty good, or so DW says...
The whole project took about three weeks of intermittent effort to complete. Hint: dried water-damaged luan explodes into sawdust with the use of an orbital plane sander, so put up a dust barrier or expect a major PITA cleaning up the dust (like I did!). HTH
