I use stainless steel wipes that I buy at the food store and buff it out with a dish towel.
I just looked this up the other day! Mineral oil really worked for me. https://learn.compactappliance.com/clean-stainless-steel-appliances/
Here is a shopping link for a very good stainless steel cleaner. I've read posts by folks suggesting to use cooking oil... I do not recommend that at all. The oil will eventually build up and go rancid.