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Chrome exempts Google sites from user site data settings.
by Jeff Johnson
In Google Chrome's "Cookies and site data" settings, accessible via the Preferences menu item or directly with chrome://settings/cookies in the address bar, you can enable the setting "Clear cookies and site data when you quit Chrome". However, I've discovered that Chrome exempts Google's own sites, such as Search and YouTube, from this setting.
@corlin yup, although i wasn't 100% sure they were doing that
i had tried using the chrome settings
then went back to using "Cookie auto-delete" extension
gives me more control over what gets cleared and when - each tab i close all cookies and site data get wiped after 30secs
can put sites into white/grey lists also
https://chrome.google.com/webstore/detail/cookie-autodelete/fhcgjolkccmbidfldomjliifgaodjagh