It is possible to kill the evercookie

Dominic White, a security consultant in South Africa, apparently started the efforts by figuring out how to purge evercookie from Safari. A reset and restart of Safari was enough to get rid of the standard cookies and the PNG, but that left HTML5 local stores and a Flash cookie behind. White wrote a script to kill these files—Safari puts its local storage in a user's /Library/Safari/ folder, in the "Databases" and "LocalStorage" directories.

It turns out to be not entirely necessary to hunt down Flash's local storage and kill the entire file. As the subsequent instructions for Chrome and Firefox point out, Adobe hosts a webpage that provides access to all of Flash's cookies, and lets you delete them individually or en masse. You can right-click on any Silverlight app to do the same. Both of these browsers appear to clear local storage when reset.