Follow along with the video below to see how to install our site as a web app on your home screen.
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For you to notice these files/folders, you must be using the "my files" icon in the app drawer or windows itself, so just navigate around with either and if using "my files" long-press the files/folders you no longer want and press delete. if using windows explorer, right-click and delete.
To be honest I'm not sure how accurate it is. I hadn't used it for a while so I just gave it a go to see what it came up with and I only got 3 results. However I know that the gs2 automatically puts unused files in a folder called lost.dir on your sd card on every boot up. Just checked this folder and it has loads of things in it. So it may just be easier to delete the contents of this folder every so often.