AppZapper

Although deleting most applications from a Mac is as easy as dragging the program to the trash, it can leave behind some files if you do it this way. Programs that you run on your Mac create some other support files related to the program, usually .PLIST files.

If you want to really keep your disk clean when removing programs you no longer use, you may want to try AppZapper. Just drag your application to the AppZapper window and it will show you all the files that the application also created and allow you to delete them along with the application in one click.

Give it a shot at AppZapper.com.