How to rid the musty smell from water leaks in RV?

On my old trailer, I removed all the old flooring down to the plywood subfloor. Rented a dehumidifier for a few days and dried it all out as best I could. sprayed everything I could with a bleach solution, then coated the exposed plywood with CPES. Laid down new linoleum, good as new! :)

And of course, make sure you've sealed up whatever was leaking.