Viruses

Your phone does not have any viruses. There are no known viruses that can infect an iPhone. If you got a message saying your phone had viruses it was a SCAM hoping to steal your identity, your money, or both. See→Avoid phishing emails, fake ‘virus‘ alerts, phony support calls, and other scams

How do I get rid of viruses on my IPhone 11?

You can't get rid of something that is not there.