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I think what's happening is the app is using Android's account manager to store credentials. These are part of the system and not removed when an app is uninstalled.
If this is what's happening then you can go to "Passwords & accounts" in settings and find the account to remove. There really shouldn't be any data left over and you shouldn't need to clear app data and cache before uninstalling, the system takes good care of that when the app is uninstalled.
it depends per app, some store it as a file (that's rather hard to delete if you don't know where you're looking for), but most apps probably use Google login. Google login can act almost seamless and will give you the idea the app keeps logged in.
Leave them installed and delete their data in settings.
Without a third party cleaning app? (I don't recommend if you aren't technically inclined BTW, most are shit) you need to go in to your system settings, find the app in question, and clear cache and local storage before uninstalling.