Typically, the vinegar contains 5-8% of acetic acid, which is made by fermentation of ethanol. The ethanol is very effective to fight against the germs and bacteria. So, cleaning the stainless cooktop with vinegar is very useful. But don't leave the vinegar over the kitchen cooktop for too long. That's because the long-term exposure of vinegar over the stainless-steel cooktop is harmful to it.