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One of the biggest advantages of being on the Mac platform is the ease with which applications can be installed and uninstalled. Unlike Windows, there is no risk of damaging a registry file that may cause problems down the line.
Uninstalling Garageband is a two part process. To remove the application from your Mac, you first need to drag the program from the Application folder to the Trash. Simply launch the Finder by clicking on the icon in the dock and navigate to the Application folder. Locate the GarageBand icon in the Application folder and drag the icon to the Trash.

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The second step for uninstalling Garageband manually is to delete the loops provided by Apple. These samples that take up to 2GB of hard drive space can be found in the Application Support folder. Launch the Finder and click on Macintosh HD. Click on Library and Application Support. Within the Application Support folder, locate the Garageband folder and drag it to the trash.
Once Garageband and its Application Support folder have been moved to the trash, right click on the Trash icon and select empty trash.