Hello to Germany, and thanks. The deposits are not thick at all. It is a very thin cloudy film. In fact, I am going to partial fill today to see if it is even visible through the water. I had put it on a sponge and drenched the side, waited a few mintes, and scubbed. No real change. I had also put on a paper towel, stuck to the side, waited a couple hours. Same thing.
I am hoping it is not etched into the glass. I can't really tell. After I partial fill today and check, if it is still a problem, I am going to haul outside and use muratic acid as a last resort.
Any other thoughts?