I need to add, I don't know how to kill the mold without bleach. I would rather have a 90% clean boat from mild soap and elbow grease than chemicals that are going to eat thread and metal (like the fuel tank).
Are keeping berth windows open . Beckson has vent insert. Maybe storing too much damp stuff. Open anchor rode locker spray with upholstery cleaner, let soak, dry with fan. J
Keep hatch open when in not using boat