With Get-WinEvent you can access the various Windows log files such as this one:
PS> Get-WinEvent Microsoft-Windows-WinRM/Operational
There is no cmdlet to actually clear such event log, though. With this line, you can:
PS> [System.Diagnostics.Eventing.Reader.EventLogSession]::GlobalSession.ClearLog(' Microsoft-Windows-WinRM/Operational')
Of course, you need Admin privileges to clear most event logs.
