Cleaning out /var/sadm/patch after Live Upgrade

I recently upgraded my OS to Solaris 10 10/09 from Solaris 10 06/06 using Live Upgrade. I wanted to clean up space in /var/sadm/patch. I'm assuming the server is now clean with a fresh version of Solaris 10 10/09. Can I safely remove everything in /var/sadm/patch?

Thanks,

jeremy