How to unlink/remove google from iphone

Hi,

I installed Google My Business app and logged in with a work Gmail account. Since then that account was coming up as though it was one of my accounts when i used the YouTube app. I uninstalled and reinstalled the YouTube app and it's still there. I uninstalled every Google app i could find, (and it is not one of my email accounts) and reinstalled the YouTube app and it's still there. How does Google still know my phone is now linked with that Gmail account? Is there some kind of cookie lurking on my phone still?

By logging in to YouTube in the app with that account i was able to "delete" that account but clearly Google still has some kind of link between my phone and that Gmail account so the delete is just superficial. This bothers me as it's a work account and nothing to do with my phone and google just bothers me anyway for their creepy tracking obsession.

Anyone know if there is still a trace of google on my phone i can remove?