1 cup bleach per gallon of water will clean it right up. Keeping it dry is the only way to keep it from happening again. I am going to try some Silica Gel Desiccant Packs next year.

Bleach will eventually rot your stitching. Use at your own risk.

Advise for next winter, store the boat in a indoor heated facility.

Concrobium Mold Control effectively eliminates and prevents mold with no bleach, ammonia or VOCs. Concrobium works as it dries by crushing the mold spores at the roots and leaving behind an invisible antimicrobial barrier to prevent future mold growth. Ideal for: homes, buildings, boats, cars and RVs. Works on: drywall, wood, composite wood, plastic, concrete, siding, shingles, metal, brick, stone, tile, grout, stucco, fabric, furniture, upholstery, flooring, and many more.

I have 2 mop buckets filled with charcoal to help with dampness that I keep in my boat whenever it is covered. Seems to work very well.

Bleach diluted if you want........... not on my boat.

This works excellent for mold removal.

Calcium chloride is the most effective. It is what you find in those little packets when you buy electronics.

I make three kitchen sieves full each year,maybe a lb or two of "salt" in each, place them over a bucket to catch the drips and it keeps the cabin nice and dry the whole winter. Could be done under shrink wrap too, placed in the cockpit.

Calcium chloride is the most effective. It is what you find in those little packets when you buy electronics.

I make three kitchen sieves full each year,maybe a lb or two of "salt" in each, place them over a bucket to catch the drips and it keeps the cabin nice and dry the whole winter. Could be done under shrink wrap too, placed in the cockpit.

^^^ Are you not hesitant that a thermostat is clicking on & off, in a petrol powered, enclosed boat?!