How To Remove Google account from Mashmellow -:
1. For removing GoogleAccount from android phone, Open your Android Mobile Settings and select Accounts.
Android Phone Account Settings- Marshmallow Phone
2. Under Accounts select Google and move forward.
Account Settings in Marshmallow Android
3. Select Google Account you want to remove from your phone.
Remove Google Account from Marshmallow Android Phone
4. Tap on three dots in right-hand side.
Remove Google Account from Marshmallow Android Phone
5. Finally, select REMOVE ACCOUNT and your Google Account remove from your android phone permanently without factory reset.