The fermentation lock or airlock is a device used in beer brewing and wine making that allows carbon dioxide released by the beer to escape the fermenter, while not allowing air to enter the fermenter, thus avoiding oxidation.
Most wood blinds are treated with a special finish to repel dirt and stains. Wood blinds can be cleaned with a good quality furniture polish and a soft cloth or clean sock. Spray the furniture polish on the cloth and wipe each slat individually. Avoid touching the cords. For heavier cleaning, you can use plain water, but be careful not to saturate the wood.
-- Susan Brainard, Tampa, FL. According to the dictionary, dust is created by airborne particles of fine, dry matter from the surface of the ground. It seems like you can never get rid of it, whether or not windows are open -- although closed windows can help to prevent pollen and other pollutants from entering.