The upcoming release of Adobe Flash Player 10.3 will give users of most of the major browsers the ability to delete Flash cookies in much the same way that they're able to erase normal Web cookies



From Threatpost:

The addition of the ability for users to delete the cookies set by plug-ins and browser add-ons gives them better control of the security and privacy of the content on their machines and is designed to address a serious issue that's been plaguing Flash for some time. Security and privacy experts have warned about the implications of so-called Flash cookies, which are set by Flash and difficult for users to find and delete.

  Chrome, IE to Give Users Ability to Delete Flash Cookies