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...because Flash is an add-on and not part of standard HTML content, browsers have not been able to delete Flash cookies the same way they delete HTTP cookies. When we released IE8, we added APIs (links here and here) for Internet Explorer so that add-ons such as Flash can respond to Delete Browsing History and InPrivate Browsing, allowing consumers to delete Flash cookies along with other data in browsing history.
Adobe recently announced that Flash Player 10.3 integrates with Delete Browsing History. This means that when you delete your cookies with Delete Browsing History, Flash Player will automatically clear your Flash cookies as well.
[blogs.msdn.com...]