Y'all might want to read this posting from Frantz Art Glass on the Perfect Clear. They are suggesting pickling the glass to get it really clean.
Haven't tried this yet, but it's an interesting thought. I have noticed that the formula in household glass cleaners has changed in the past year, making them so that they actually make the glass worse. I think it'd the swithch to the "green" cleaning ingredients.
Could it be that simple? Will resellers offer pre-pickled glass?
Would just soaking in vinegar do it?
Worth trying anyway. Hmmm - now to chase down some pickle.