Deleting all gmail messages from iphone 5s?

I have like 1400 emails in my gmail box how do i delete them all at once?

If you want to delete the Gmails it's better to do it on a computer. If you want to keep the contacts associated with Gmail but not email, go to Settings> Mail, Contacts, Calendar and tap the Gmail, turn email off.

On the phone you have to select them individually. As stated the fastest way would be using a computer.

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