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.
The best tool for cleaning and preparing exterior wood siding is a stiff-bristle brush and a bucket of soap and water. Before you paint, clean the surface to get an idea of how your project will shape up. For paint to perform well, it has to stay on the surface. Paint can't adhere if the surface isn't clean.