Concrobium Mold Control, 32 oz Spray – Eliminates & Prevents Mold – EPA-Registered, Bleach-Free, Odorless, VOC-Free

Boat owner here. Try Concrobium. Works well especially on hard surfaces. Spray it on and let it dry. If you search there’s DIY formulas it’s essentially a base solution. https://www.amazon.com/Concrobium-25326CAL-Mold-Control-Spray/dp/B084CNTQX2