Put a paper towel on the tray and pour vinegar on it. Pour enough to saturate the paper towel. Let it sit. You can put a saturated paper towel on the water dispenser. You might have to cover it in foil to keep it on.
That is hard water deposits you are seeing. Clean it up the best you can with vinegar and maybe a magic eraser. You could use harsher cleaners too . If the tray comes out, it is easier to clean. We have a soft water system and reverse osmosis for the drinking water so we do not have the hard water deposits. However, my mom had this on a refrigerator. We were selling the house and I wanted it to look nice. I cleaned it the best I could and then carefully taped everything off with paper and painters tape. I then used spray paint designed for plastic. I used black. It came out so nice. We stopped using the water at that point since we were listing the home so I don't know how long it would hold up. We ended up selling the fridge on Craigslist after house sold, but we told the buyer what we had done. He was not going to hook up water to the fridge, so he did not care.
I use vinegar and baking powder made into a paste and an old tooth brush to remove the hard water stains/mineral deposits on mine. I only have to clean mine every few months
Soak in white vinegar. For the parts that don't come off/out wrap in a paper towel soacked with the vinegar and cover with a baggie. Be generous, it's cheap. Tie on for several ours.
Can't afford anyone to look at it and although the temperature tested as safe etc....its driving me mad...I'm having to leave tea towels on the floor. ..which are sog...
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Just baking powder. I use it to clean my teeth and my oven glass