In the right pane, find SketchUp # folder, and then drag it to the trash.In the left pane of the Finder window, click Applications.In the Application Support folder, find the SketchUp # folder, and then drag it to the trash.To see the Library folder you'll need to hold down the Option (Alt) button on your keyboard, click Go in the menubar, then select the Library option in the drop-down list.In the left pane of the Finder window, click your user name, then click Library* in the right pane.Delete the SketchUp folder from your user library:.(If you have more than one instance of SketchUp open, make sure you quit all instances of SketchUp.)