How do you remove black spot arise due to use of harpic in stainless steel sink?

To remove black spots from a stainless steel sink caused by Harpic, create a paste using baking soda and water. Apply the paste to the affected areas, gently scrubbing with a soft cloth or sponge. Rinse thoroughly with warm water and dry the sink to prevent further stains. If necessary, repeat the process or use a stainless steel cleaner for additional shine.