People are only now discovering that there is a hidden part in their sink - and a lot of dirt has accumulated in it. Hazel McKinney and Claire Jenkins, known online as the We Scotty Cleaners, regularly share their tricks and tips for cleaning the house on TikTok.
The overflow hole in your sink is that drain opening at the top of the sink where the excess water pours out when the sink fills. If you happen to have mold or mildew build up in the sink overflow hole, it's going to leave you with a nasty smell.