How do I remove old food stains from aluminum foil facing after cooking with it?

To remove old food stains from aluminum foil facing, start by scraping off any loose debris with a spatula or scraper. Then, soak the stained area in warm soapy water for about 15 minutes. Use a soft cloth or sponge to gently scrub the stains. For stubborn stains, make a paste of baking soda and water, apply it to the stain, and let it sit for a few hours before scrubbing. Rinse thoroughly with water. If stains persist, consider using a non-abrasive cleaner specifically designed for aluminum surfaces. Always test any cleaning solution on a small, inconspicuous area first to ensure it doesn't damage the surface.