system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: When people don’t wash casserole pots for years to retain the flavour. How do the little particles of food not go bad and make you ill?

Similarly when people don’t wash tea pots or Yorkshire pudding trays for the same reason. I’m not against it and I know it doesn’t make you poorly… but how?
gpt
The casserole pot is presumably going into the oven every time it's used so it will be cooked at a high enough temperature to kill anything harmful that may still be there after rinsing, A tea kettle is filled with water that is then boiled so it's the same principle.