While cleaning my kitchen and behind my fridge, I found this part on its back. It was filled with a moldy liquid that looked like water. I threw the liquid away and cleaned the part. I’ve added a bit of water back (not as much as it had) and put the part back in its place.
I found the manual for a similar fridge model but I see no reference to the part.
My question is what is this part for, and how should I take care of it?