I've used Bon Ami cleanser with great results on tough water spots.
http://www.bonami.com/index.php/prod...quid_cleanser/
http://www.bonami.com/index.php/prod...wder_cleanser/
It has never scratched for me. Although I would suggest you try out on a piece of glass first. I don't use it all the time. Just every so often when I get those tough spots.
http://www.ehow.com/how_4966861_remo...indshield.html
-Jim


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