Are the panels adjacent to the smiley failing also? Just the center "window? Odd indeed. Just soap and water? maybe. Doing something forever never ensures it is done right. Also if it was caused by a specific product would all panels show similar condition? To your question. No never seen that level of deterioration in glass so new.
I never wash the glass with anything but plain water then clean with purpose made cleaner. There are many good products for the glass. Imar stratoglass cleaner is what i am using now. When you figure this out post it up. Sorry for your trouble. perplexing to be sure.
Dave.
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