The gray hand pad removes stains below surface level embedded in the metal substrateUsing the hand pad creates a deeper level of clean not achieved with the microfiber towel onlyPads should only be used on a surface still wet with Step 1 Anodized Aluminum Cleaner.Test using the gray hand pad in a small area before using on the full job.DO NOT USE GRAY PADS ON A DRY SURFACE to avoid scratching the surfaceCare should also be taken near edges of window frames to avoid damageDipping the gray pads in Step 1 Anodized Aluminum Cleaner is a great technique to increase lubricity and further minimize the risk of scratching the surface.Agitate the surface with the gray hand pad using light pressure, which will lift oxidationFollow with your wet microfiber towel to clean oxidation lifted by the hand padContinue use of the gray hand pad until all visible white oxidation has been cleanedAllow the now clean surface to dry.Dry time is subject to environmental conditions such as direct sun or shade, temperature, and humidity.  For larger jobs if time allows, the ideal process is to complete all Step 1 cleaning before applying the Step 2 Enhanced Surface Sealer.  Allowing the Step 1 to dry will help reveal any spots that were not fully cleaned, which you should revisit prior to applying the sealer.  If time doesn’t allow for a complete air dry of the Step 1, a dry microfiber towel can be used to buff the surface dry to ready it for the Step 2 Enhanced Surface Sealer.