Removing Google account completely from deep inside the system

Hey xda'ians.
I wanna ask if there's a way to remove completely the Google account from deep inside the system so that whenever I reset or flash any custom ROM it shouldn't ask for the previous account which was signed in.
Actually I am facing a problem with my google account and I cannot access it any way possible.
Plss if any one knows how to it would be a great appreciation and help

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