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.
Scrape the burnt wood off with a small razor blade or a slim utility knife, then apply a clear finish to the wood until the affected area matches the rest of the box. Spray furniture polish onto a rag, then wipe the entire wooden surface of the box down gently. Ensure that all dust is removed.