Meguiar's DynaCone Pad Cleaner;

This is the same cleaner included in Meguiar's Wheel Polishing Kit. A fast-acting solution that dissolves metal polishing grime, leaving behind a like-new tool that is ready to detail at a moment's notice. This gentle formula can be used on any metal polishing or foam pad. To watch the dirt disappear, simply spray the product on the foam until it is thoroughly wet, and allow it soak in for a minute or so. Then dip the pad into warm water and watch the grime leave the foam pad as you squeeze the water out. Rinse the pad thoroughly with clear water before allowing to air dry.