For simple clean-up, use soap and water. For over-the-counter type products, you may use Mr. Clean Magic Eraser or Simple Green Extreme. Avoid products that contain strong cleaning agents such as bleach or lye. Products such as Comet Cleanser, Ajax, Brillo, or Bar Cleaner have bleach in them and these chemicals may cause yellowing and cracking of the whitewalls. Do not use Armor All on whitewalls. Sadly, some products that are designed specifically for cleaning whitewalls have bleach in them, so be careful.