I think you need to block flash entirely, before you ever let it on your system OR you need to stop deleting it once it is there.
Suppose I run a site. I want cookies on your box for 'security'. You let them in but then nuke them. My system is going to notice this and I'm going to wonder why somebody safe would do such a thing. I'd figure the odds on you were poor, and want you to go away.
On the other hand, if my system sees that you NEVER get the cookies, I might assume you are savvy enough to block them and I may respect your good judgement. Or I may assume that your system doesn't support flash or has a bug which doesn't handle flash properly.
You are better off not letting it in the door than you are if you let it in and kick it out ad nauseum.
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