A few months ago, while cleaning, I took the plastic cover off the back (of the inside) of my freezer (covers the fan and the cooler) and things looked fine:
I didn't put the cover back on and later noticed this metal thing went rusty:
(That's not really 'regular' iron rust, it's somehow soft and kind of greasy.
That is also the reason why the fan is unplugged in the second photo. It spatters crumbs/drops of this rust around when it's running.)
So I took the metal part off, cleaned it with bathroom cleaner and steel scourer/scrubber and put it back in. Some time later, it got rusty again. (I hadn't put the cover back)
So, what I would like to know is: does it go rusty because there is no cover? Can I clean it again and put the cover back and rest assured it will not go rusty again underneath it?
Or do I have to replace it? What is this material anyway? Zinc? Does it have a special purpose apart from holding the fan and its motor in place?
Many thanks in advance!