1. Toothpaste treatment: Squeeze some toothpaste on the black area of the stainless steel surface, and then wipe it back and forth with sandpaper. Under the action of friction, the black color can be removed. After removal, rinse it with clean water and the brightness will return.
2. White vinegar treatment: Put the stainless steel item into the pot, then pour in white vinegar and water, the capacity should exceed the stainless steel item itself, heat it for some time to allow the white vinegar and the black part to fully react, then take out the stainless steel item and leave it for two days, and the black part will be Will fall off.
3. Cleaning powder treatment: Pour some water on the stainless steel surface, wet it, and sprinkle with special cleaning powder. Make sure that the black parts are covered and wait for about 3 minutes. You can wipe it with a scouring pad for a while so that the black parts will fall off.
4. Clean the surface: Use a mild cleaning solution or stainless steel cleaner to clean the affected area. This will help to remove any dirt, grime, or residue that may be contributing to the black spots.
5. Use a stainless steel polish: Apply a stainless steel polish to the affected area and rub with a soft, non-abrasive cloth. This can help to remove any remaining black spots and restore the shine to the stainless steel surface.

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