To determine if your old aluminum foil is recyclable, check for the following: it should be clean and dry, with no food residue or oil. Foil that has been heavily greased, contaminated with non-food substances, or is corroded is typically not recyclable. Additionally, ensure it's not mixed with other materials, such as plastic wrap. If your foil meets these conditions, it's likely recyclable. Always check with your local recycling program for specific guidelines, as they can vary by region.