Hi

I just noticed that my oven in my tenanted flat is starting to rust badly. See pictures.

I suspect that tenant must have used some cleaning agent/chemical which accelerated that or even started it. The current tenants do not know and it might have been the tenants before them last year too.
Its 3.5 years old ad should not rust that badly. Any idea how to stop that?
Bear in mind that any treatment must be food save and withstand oven temperatures.Click image for larger version. 

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