Clear events from an event log and, optionally, back up cleared events. Usage: wevtutil { cl | clear-log } /OPTION:VALUE ...

Clear events from an event log and, optionally, back up cleared events.

Usage:

wevtutil { cl | clear-log }  [/OPTION:VALUE]


Name of log to clear. You can retrieve a list of log names by typing
wevtutil el.

Options:

You can use either the short (for example, /bu) or long (for example, /backup) 
version of the option names. Options and their values are not case-sensitive.

/{bu | backup}:VALUE
Backup file for cleared events. If specified, the cleared events will be saved
to the backup file. Include the .evtx extension in the backup file name.

Example:
 
The following example clears all the events from the Application log after saving 
them to C:\admin\backups\al0306.evtx.

wevtutil.exe cl Application /bu:C:\admin\backups\al0306.evtx