Delete Flash Cookies
Flash is an add-on and not part of standard HTML content. As a result, browsers have not been able to delete Flash cookies normally stored in: the same way they delete HTTP cookies. To delete Flash Cookies, one had to follow one of these three ways of doing it. But now Adobe has announced that Flash Player 10.3 integrates with Delete Browsing History in Internet Explorer. This means that when you delete your cookies with Delete Browsing History, Flash Player will automatically clear your Flash cookies as well; provided of course you are using these versions of the software.
Microsoft has created a Test Drive demo page that you can use to test this out using your IE. UPDATE – 30 Aug 2018: The demo page is no longer available with Microsoft.