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$ sudo rm /usr/local/mysql  
$ sudo rm -rf /usr/local/mysql*  
$ sudo rm -rf /Library/StartupItems/MySQLCOM  
$ sudo rm -rf /Library/PreferencePanes/My*  
$ sudo rm -rf /Library/Receipts/mysql*  
$ sudo rm -rf /Library/Receipts/MySQL*  
$ sudo rm -rf /var/db/receipts/com.mysql.*