comments:
yeah unfortunately you're supposed to season them occasionally which will polymerize the oil that cuts it and bond it to the cast-iron and prevent it from rusting . Even if it's not exposed to direct moisture humidity is enough to rust if it is never seasoned occasionally. you should be able to take those out and put them in a garbage bag and use some type of vinegar or oven cleaner to help remove the rust to prep it for a clean seasoning. you wanna coat it with thin coats of oil several times to get a good season. after you're done cooking I'd recommend using a good steam brush cleaner to get any hard gunk off. And then once any water has evaporated you can put a thin coat of high temperature oil to help protect it and renew the seasoning between cooks. hopefully the rest should just be surface rest that is flaking off. Even then you can usually flick them over and use whichever side looks best with the less amount of pitting. Worst case I saw some replacement ones on Amazon that are sold as Amazon returns and honestly they're usually fine and brand new and it's mainly because people return them because they bought the wrong model grate.https://a.co/d/0bNRvN9m