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.
One of the easiest methods for laminate furniture is a dry erase marker! You basically just have to trace the stain with the dry erase marker and it will come right off. Wipe off the dry erase marker with a cloth or paper towel. Be sure not to use a Magic Eraser on high gloss furniture! It will rub off the finish. Other methods that may work depending on the type of furniture are rubbing alcohol, nail polish remover, regular toothpaste (not gel) and baking soda, pencil eraser, or WD-40.