Prevent mold in lanai in florida
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How to prevent mold on window frames in lanai on Florida?
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I would wash them on a regular basis with bleach water. You can also buy a product that cleans mold off things. Mold grows from spores in the air so nothing will remove mold forever.
Assuming that you are not air conditioning the space it's all about air circulation.
http://homeguides.sfgate.com/remove-mold-window-casings-28469.html
Use a dehumidifier.
With all the humidity in Florida you'll always have mold unless you dry off your window and screen frames regularily. If you see mold, wash with bleach water or spray with Tilex Mold and Mildew remover.