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Invisible glass makes a glass stripper that can really help with problems like this. It is a cream, similar to a liquid polish. It takes a little bit of elbow grease to use it but I was really impressed with the results. It really gets the glass smooth.
Might try to same thing you use to get off hard water spots - vinegar, and if needed, muratic acid diluted 1:10 with distilled water to help remove etched water stains.
How long did they last?
I agree, price difference to the Bosch is significant, glad to hear you're happy with them. Will certainly consider them next time.
I splurged and got myself the Bosch, performing fine so far.