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.
Scrub the rust away using a stiff, wire brush. This will remove flaking rust and as much of the surface rust as possible. You won't be able to get all the rust off if the rust is extensive. Wash the metal roof using trisodium phosphate in water at a ratio of 1 cup TSP per 1 gallon water. You can wash it by hand, using a sprayer attachment to a garden hose or a power washer. A power washer may remove more of the rust for you.