Uninstalling Applications / Preferences

Normally to uninstall an application i dont want i simply drag and drop it into the trash, but this leaves all the preferences for said application intact through the hard disk.

So how am i ment to uninstall and remove all these preferences and left over files without doing it manually?

I know they do no harm staying there and the amount of space they take up is small (although it does start to add up), but its more of a psychological thing of me not wanting there for no reason.

For example on windows 7 i use a program called revo unistaller which uninstalls the program normally and then scans the registry and filesystem for any left overs and removes them.

Is there an OS X equivalent?

On a side note..
Ive heard and tried ONYX but it messed up my permissions for files and for the system and forced me to do a reinstall. Is ONYX recommend to use or is something else better?

Thank you for your help

 

Thats perfect, thank you