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www.bluewidgets.com/blue_widgets.aspx?=(i want this to be ignored)
i want to rewrite a ton of urls to clean things up and want to be sure that anything after the question mark is ignored and not indexed..
If google does not ignore this then i might be able to do it through the robots.txt like
any other way?
Yes, use robots.txt to disallow those urls. Google has a help page about it here: [google.com...]
You also may want to test your robots.txt file with their Webmaster Tools [google.com].