App Uninstaller is a special app designed to remove programs. If you simply drag any application to the Trash some files may be left on your disk. Have you wondered that if you uninstall and after a while install any messenger again you have older message history? You may guess it’s because they are saved online? No, they are saved on your hard drive!
When you drag and drop the app to the Trash, you simply delete the .dmg file, It means all its service files leave on your hard drive. View the real structure of messenger applications on the picture below.
Some messengers’ service files may store huge amount of space. You can delete them manually or use App Uninstaller. The app is also great if you need to reset any application. Simply delete all support files except .dmg item.