What cleaning products should I use on the porcelain enamel burner caps?

Use hot sudsy water and dry thoroughly, or nonabrasive cleaners like ammonia, Fantastic, or Formula 409. For stubborn stains, use mild abrasive cleaners such as Bon Ami, Ajax, or Comet. A stiff nylon bristle toothbrush can clean port openings. Always apply minimal pressure with abrasive cleaners and do not soak burner caps. (Page 8)