Al limpiar todas las cookies en Chrome 69 las cookies de Google no se elimininan, o mejor dicho se eliminan y se recrean automáticamente.
https://twitter.com/ctavan/status/1044282084020441088
https://twitter.com/ctavan/status/1044517442993737729

Además al limpiar "cookies y otros datos de navegación" no se vacía el almacenamiento local.
https://twitter.com/ctavan/status/1044285835133300736

Otra nueva función del último Chrome es que al conectarte a sitios de Google (como Gmail), Chrome automáticamente va a conectarse a tu cuenta de Google, sin siquiera preguntarte ni notificarte.
> A few weeks ago Google shipped an update to Chrome that fundamentally changes the sign-in experience. From now on, every time you log into a Google property (for example, Gmail), Chrome will automatically sign the browser into your Google account for you. It’ll do this without asking, or even explicitly notifying you. (However, and this is important: Google developers claim this will not actually start synchronizing your data to Google — yet. See further below.) (...)
https://blog.cryptographyengineering.com/2018/09/23/why-im-leaving-chrome/