How should I clean the burner caps and burner base?

Clean the burner cap exterior (porcelain enamel) with hot sudsy water, rinsing and drying thoroughly; nonabrasive cleansers like Fantastic or Formula 409 can also be used. For the burner base and underside of the cap (aluminum alloy), use detergent and hot water or abrasive pads like Brillo or S.O.S., then rinse and dry. Do not soak burner caps, and clean clogged ports with a wire or straightened paper clip — never a toothpick that may break off. (Page 14)