Note: Never, ever use any type of oven cleaner on your charcoal grill. Most oven cleaners are so harsh that they will take the paint right off your grill. Bad news! In fact, you’re not supposed to use any type of harsh cleaner on your grill. And, you don’t need to apply a wax to your grill either. The porcelain enamel is baked-on and is quite shiny and durable under normal use.
After the ashes are gone from the body of my charcoal grill, I simply wipe off the outside with a damp, soapy rag. I then wet the rag and wipe out the inside as well. Before I rinse the body off, I wipe off the ash catcher tray. Then, I spray the body clean, inside and out, as well as the ash catcher.
Finally, I wipe off the legs and any other parts on my charcoal grill. You can dry it off with an old rag. Personally, I always leave it apart and allow it to dry in the sunshine.
Then, assemble your charcoal grill and store it in your garage or in another dry place in between uses. Or, you can buy a cover for it at your local garden supply store. The cover will protect it from the elements, tree sap, leaves, and bird droppings if you want to leave it outside.