For cleaning, you will need alcohol or vodka, water, glycerin, ammonia, rubber gloves, and an old toothbrush.
Mix alcohol, water, and ammonia in equal proportions, for example, one teaspoon of each ingredient.
If you are using vodka instead of alcohol, you will need 2 teaspoons.
Apply the resulting solution to the knobs and let it sit for 5 minutes before starting to clean.
Any sponge will work for cleaning, and for hard-to-reach places, use an old toothbrush. Finally, wipe the knobs with a damp cloth.
