Baking sheets are the unsung workhorses of the kitchen, but over time, high heat and cooking oils turn pristine metal into a mottled, brown mess.While some people assume those dark, burnt-on stains are permanent, or reach for harsh, toxic oven sprays, you do not need industrial chemicals to restore your pans.The secret lies in using mild abrasives paired with a chemical reaction to break down polymerized fat without destroying the underlying metal.Here's three simple cleaning methods that strip away years of built-up grease with the least amount of elbow grease.Why dish soap fails on polymerized fat
(Image credit: Shutterstock)That tough, brown layer on your sheet pans is not just dry oil, it is polymerized fat. When cooking oils are repeatedly exposed to high oven heat, their chemical bonds break down and cross-link into a tough, plastic-like varnish that fuses directly to the metal surface.Standard liquid dish soap is formulated to trap fresh, liquid surface fats, but it completely slides off this hard, cured barrier.While abrasive metal scrubbers might scrape off small patches, they also create micro-scratches in your pans that make future grease stick even faster.Get instant access to breaking news, the hottest reviews, great deals and helpful tips.To break the bond permanently, you need an oxidizing or alkaline reaction to dissolve the polymerized layer from the inside out.How to remove burnt-on grease from baking sheets
