The small hole on the sink, which seems unnecessary actually has a surprising function

useful for areas that cannot easily be reached with a cloth or sponge.

Rinsing the Passage After Cleaning

After the mixture has had time to work, rinse the overflow opening with warm water. The water helps carry away the loosened material and any remaining vinegar or baking soda.

The rinse should be directed carefully into the opening so that it travels continue reading …