sudo rm /usr/local/mysql
sudo rm -rf /usr/local/mysql*
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/My*
Edit /etc/hostconfig
and remove the line MYSQLCOM=-YES-
rm -rf ~/Library/PreferencePanes/My*
sudo rm -rf /Library/Receipts/mysql*
sudo rm -rf /Library/Receipts/MySQL*
sudo rm -rf /private/var/db/receipts/*mysql*
sudo rm -rf /var/db/receipts/com.mysql.*
Edit /Library/Receipts/InstallHistory.plist
and remove all nodes that include mysql
sudo rm -Rf /var//mysql
rm -Rf /var//mysql/mysql.sock
sudo rm -Rf /var//root/.mysql_history
sudo rm -Rf /usr/local/var/mysql
Then to install using Mac Ports, use: http://www.perfectline.co/blog/2010/01/how-to-install-mysql-on-mac-os-x-snow-leopard/