:: What is Plesk
The Parallels Plesk Panel (ex: Parallels Plesk Control Panel, Plesk Server Administrator, PSA,[citation needed] or just Plesk) software package is a commercial web hosting automation program. – wikipedia
 
:: How to Uninstall Plesk
o Login to server using root
o Remove / uninstall plesk packages

 
:: Link
+ Google
+ ServerFault