Contrary to popular belief, uninstalling an application from your Mac these days is not just about dragging it to the trash: that leaves all kinds of files lying around on your computer. There's just no hope of trashing applications 'the Mac way'...or is there?
Unlike other clean-up applications that you need to launch to do the actual clean-up, Tidy sits right there along your trash can. When you drag an application to the trash, it will go and hunt down all related files and also move them to the trash. Now that's a clean Mac!