well then.
Chrome won't delete google cookies when you ask to "delete all"
TBH, I haven't tested this (I don't do "nuke all" with my cookies) But if it's true, it's pretty damning.
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so, yeah, I just tested this with my cookie editor extension - can't delete all of them. I can delete most of them and they don't immediately come back... I don't know what that really means tho.