Some days ago I noticed that YouTube knows the videos I watched even though I de

Question

Some days ago I noticed that YouTube knows the videos I watched even though I deleted my cookies. I also was not using a YouTube-account. When I noticed I used IE 11. After some research I found out that YouTube uses zombie cookies. For those who don't know: zombie cookies are cookies that don't get deleted if you use the "delete cookies"-function in your browser. In most cases they are flash cookies and you have to delete those to "kill" these zombie cookies.
But even after deleting my flash cookies YouTube still knew the videos I watched (I tested that in most cases on this site: https://www.youtube.com/feed/history This site shows you, how many videos you watched so far).
So my question is: How is YouTube identifying my, even after deleting flash cookies? How can I can delete the information YouTube has of me?

Explanation / Answer

I do the following to force youtube to "forget" me.

If you do want to allow some sites to store data in flash, you can block just one site. The reason why google can rebuild the history is (probably) because it has the data both in web cookies and flash cookies, so as long as one is present when you visit youtube, google can rebuilt the other cookies.

Source: I just tried this :)

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