How to clean viruses from iPhone !?

That is not a virus. You have inadvertently subscribed to some bogus, spammy calendar by accepting a “free offer” from a web site.

If running iOS 13 or earlier versions, check: Settings - Passwords & Accounts - Accounts - Any rogue entries here? If so, delete the rogue account. 

If running iOS 14, check: Settings - Calendar - Accounts - Any rogue entries here? If so, delete the rogue account. 

The Apple support article is below. 

https://support.apple.com/en-us/HT211076

That is not a virus. You have inadvertently subscribed to some bogus, spammy calendar by accepting a “free offer” from a web site.

If running iOS 13 or earlier versions, check: Settings - Passwords & Accounts - Accounts - Any rogue entries here? If so, delete the rogue account. 

If running iOS 14, check: Settings - Calendar - Accounts - Any rogue entries here? If so, delete the rogue account. 

The Apple support article is below. 

https://support.apple.com/en-us/HT211076

The virus keep alerting me like this all the time I want to clean it out . Please help to clean it out

Have you did it yet ? This calendar still alert me . Please make it gone and delete it .

Please describe the symptoms of the “virus”.

Please delete Mcafee as it is 100% useless. Also check for any subscriptions you may have to Mcafee, and cancel if there.

You are welcome.

Hopefully the bogus calendar entries are gone?

Stay alert, as scammers are forever trying new methods to fool us.

Yes I hope it gone . Please help to clean it . Thanks you