To clean the internal, hidden from the eyes cavities, it's enough to arm yourself with a vial of simple vinegar, which can be found in every kitchen. It is necessary to remove the "speaker" and set it vertically so that it doesn't fall down. Vinegar very gently removes rust, oxidation, and seals from dust and dirt, often the causes of failure. Physical strength and perseverance, in our case, are not the best helpers, so we pour the vinegar into the funnel to the top and leave it overnight in the garage or on the balcony. In the end, you will have a loud horn that will work without obstruction.
