To clean aluminum foil facing, start by removing any loose dirt or debris with a soft brush. Then, use a mild detergent mixed with warm water and a soft cloth to gently wipe the surface. Avoid using abrasive cleaners or scrubbers, as they can damage the foil. For stubborn stains, a mixture of equal parts white vinegar and water can be applied with a cloth, followed by rinsing with clean water. Always let the surface dry completely to prevent water spots or damage.