I bought my 03 S used and didn't notice anything until one day when the windshield fogged up.
There appears to be a very large stain "baked" into the glass where it looks like someone left something on the windshield without bothering to clean it. I don't know if it was a drink or egg or what but nothing I do has any effect on it.
Anyone have any tips or suggestions short of replacing the windshield?