How do you clean the bottom of pans when they turn brown?

To clean the bottom of pans that have turned brown, you can create a paste using baking soda and water, applying it to the stained areas and letting it sit for a few minutes before scrubbing with a non-abrasive sponge. For tougher stains, vinegar can be used; simply soak a cloth in vinegar and wrap it around the bottom of the pan for a few minutes before scrubbing. Alternatively, commercial cleaners designed for cookware can effectively remove discoloration. Always rinse thoroughly and dry the pan after cleaning to prevent any residue.