If you’re ever cleaning a porcelain sink, it’s a good idea to use vinegar and baking soda. This combination will clean the sink quickly and effectively, and it’s also a great way to prevent any further damage to the porcelain. To begin, pour some vinegar into a small bowl. Add enough baking soda to make a thick solution, and stir until the ingredients are well combined. Pour the mixture onto the dirty sink area, and wait for it to work its magic. After about 10 minutes have passed, your sink should be clean and free of any dirt or debris. If there are any problems with the cleaning process, be sure to contact your installer or plumber for help.