We own a beautiful old sail boat and we keep it at the dock behind our home. South Florida is a very damp location. We used all types of suggestions to fight the mold that used to grow on our boat. We cleaned with white vinegar and soap, but the mold always came back. Running the air conditioning only slows the return. About three years ago, we discovered a tea tree product that made a real difference. Not only did it stop the mold growth but prevented the return for almost 60 days. The big problem was the stuff is very expensive and smells like bad pine oil, not good at all. Then about 6 months ago we discovered a new product made from essential oils and it has a delightful lemon minty fragrance. Best of all it lasts much longer, up to 120 days and costs less. The two products are Kanberra Gel (selling for $49.99 plus S&H) and the other newer product is PURAFY AIR gel (selling for $39.90 plus S&H). Both 8 ounce products can be purchased on line and we have eliminated the mold problem on the boat. We also keep open containers in our home to eliminate odors from all sources including dog, cat and cooking odors. The PURAFY AIR gel, in our home lasts up to three months and odors don’t return for up to 4 months even when the gel has all evaporated out of the container.