well my friend and i were look for it and we found it yesterday and for a mac i dont know about a pc but for a mac you click on finder, you got to places and click on your name, than go to library, than preferences, than go to macromedia, then go to flash player, go to macromedia.com folder, then go to support, than go to flashplayer, than sys, and you have all you history of some sort
hope this helped i dont know how to clear it but i do know it shows all of it