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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*
$ 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.*

# Edit the following file, removing the line `MYSQLCOM=-YES-`.
# you may need sudo for write privileges to edit the file
# TIP: when using vim, use `dd` to delete the line and then `:wq` to save
#      the file
$ sudo vim /etc/hostconfig   # remove the line MYSQLCOM=-YES-