How can I permanently delete my WhatsApp chat history on iPhone?

I have already cleared all chat histories and have made a backup several times to overwrite the old backup. Is that enough? or:I have already cleared

I have already cleared all chat histories and have made a backup several times to overwrite the old backup. Is that enough?

or:I have already cleared all chat histories and have made a backup several times to overwrite the old backup. Is that enough?

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