If you mean the dark ring or black stain around the base of a faucet, it’s usually caused by a combination of mineral deposits, soap scum, mold, or grime trapped where the faucet meets the sink.
Here’s how to clean it:
- Apply white vinegar
- Soak a paper towel or cloth in white vinegar.
- Wrap it around the stained area for 30–60 minutes to loosen mineral deposits.
- Scrub gently
- Use an old toothbrush or a non-scratch sponge.
- If needed, make a paste of baking soda and a little water and scrub the area.
- Rinse and dry
- Wipe with clean water and dry with a microfiber cloth.
If the stain remains:
- It may be mildew or mold under the faucet base. A bathroom cleaner labeled for mold or a diluted bleach solution can help, but never mix bleach with vinegar or other cleaners.
- If the dark ring is actually corrosion or worn plating, cleaning won’t remove it and the faucet may need repair or replacement.
If you can upload a photo of the faucet, I can help identify whether it’s mineral buildup, mold, or corrosion and suggest the best cleaning method.
