I have always used Steam-Clean or just wiped out our oven, we bought it in 2018 but have always taken really good care of it. Did "Self-Clean" for the first time for a 3h clean. I went to wipe out the oven after the clean and the blue enamel is chipping off with just a gentle wipe down. I am really concerned about this for obvious reasons. Is there any way to stop this from happening worse? Is it safe to keep using the oven?