Uninstalling MySQL or resetting to default settings (advanced question)

I'm trying to install an application that is dependent on the MySQL server. I was installing some other programs and for security reasons I changed the password setting for the server to be able to access MySQL. It worked fine for the other applications I was installing but prevents me from installing application provided by ReadyNAS, as it seems they rely on the default settings to properly install. After some consideration, I have just decided to stick with the application provided through Netgear but I need to reset everything in MySQL. I have tried uninstalling the program, but the removal process leaves the databases behind, meaning when I reinstall MySQL, it finds that same stored user setting as before. I need to know if someone knows how to do a clean install of MySQL or can help me identify all the additional files I need to remove through SSH to complete the uninstall process through OS6?????