I use the Woody Wax, it works great on the non-skid as well as the anodized metal.
For the non skid, you clean the non skid, using a damp mop head or soft brush head, apply the woody wax the the wet non skid, covering it with a light coat of woody. When it dries, throw a large towel on the deck on buff it out, easy and it keeps the decks nice and earier to clean for a good period of time.
Jonathan