So these are stains that I tried to get off with everything this board has adviced. Still no end in sight. I tried baking soda, citric acid, white vinegar, bar keeper's friend etc.
Does anyone know what these are? First time I'm getting these in 5 years of cooking, hard as hell to get off. I even tried to scratch it off but it doesn't work.
These are probably mineral deposits. Boiling water or washing with hard(er) water can leave them.
You can scrub with a plastic pad, use vinegar, etc. I have found that denture cleaner works well for this. Drop one or two tablets in a pan full of cold water, let it sit for 20 mintues, and then rinse it well. A sponge or plastic abrasive pad should remove any remanents easily.
The film will probably reappear in a few months, so regular treatment is recommended. As for the denture cleaner, a generic brand with a hundred or so tablets will cost you a couple bucks. Also good for cleaning stains off porcelain.
That said, it shouldn't affect the flavor or healthfulness of your food.
