This has happened to me a few times. Luckily, it’s not permanent. I thought it was the first time it happened, and I was pretty upset with myself. But over the course of a few days, the cloudy marks or stains disappeared.
What causes this? Heat and moisture. Everytime it’s happened to me it was because a moist dish towel or dish rag got laid on top of a heated stove top. The heat could be from recent stove top cooking or recent oven use. It doesn’t require much moisture. Your towel can have just the slightest bit of moisture ( example: drying your hands on the towel ) to result in these cloudy spots.
If you just can’t stand the cloudy spots for a few days, keep the stove top oiled with lemon oil or furniture polish. This will somewhat blend the cloudy spots with the rest of the stove top. This is only temporary. When the oil dries, the spots will still be there. Just keep oiling it.
Don’t fret too much. It will go away. Just be more careful next time with your moist towels. Even though I try to be careful, it’s happened to me more than once.