When I delete Yahoo Mail app my info is saved?!

[Turnpike]

I have 2 Yahoo accounts, they are not merged or able to be logged in from each other. Completely seperate.

So I delete Yahoo Mail and all other Yahoo apps from my phone, so Yahoo Mail account A should be completely erased from my phone, right?

So when I restart everything and download Yahoo Mail again, before I can sign into account B my Account A info is STILL ON MY PHONE, even though I just downloaded the app again fresh.

How can this be? How can I erase all of my Account A info from my phone?

As far as additional info, Yahoo Mail app is the ONLY non-stock app I download on this particular phone. I don't have other Yahoo or other third party apps on this particular phone. Like if you log into Gmail, that account is also logged into YouTube or at least linked somehow because they are the same company... well there ARE no other apps on the phone besides what it comes with and the Yahoo Mail app. I don't even use the stock iPhone email app or iCloud either.

Any suggestions how it's saving the info? Thanks!

 

[Helmsley]

It sounds like the app is storing the details in temporary files somewhere, which are unaffected when you remove the app.

There are some tools out there that can clean up temporary files. I use one called iMyfone Umate.