In the meantime, it is possible to delay or prevent having to replace the floors by minimizing the amount of mold growing on the bottom of the floors.
I do two things.
1, I always open the water-tight door between the front cabin and the chain locker when I am in a marina. This lets air circulate in the chain locker.
2, Once or sometimes twice a year, I run an ozone generator in the chain locker. A small but powerful ozone generator costs about $80 as I recall. It not only kills mold and mildew, it oxidizes rubber—causing it to age quickly. Be careful where and how long you run it if you get one. The ozone has a short half-life so you don’t have to stay away long if you use it inside the boat.
Miles S/Y Ladybug, sm216 Le Marin, Martinique