To clean a dirty screen:
1.Slightly dampen a corner of the cloth with water and wipe off the screens to loosen any dirt or foreign material.
2.Using a dry portion of the same cloth, wipe the screens to dry them and finish the cleaning process.
3.If needed repeat the process more than once.
Never leave your 3DS in ur pockets it could scratch the material.
Protective screen covers can lower the sensitivity of the Nintendo DS touch screen. They may also damage screens as they can leave behind a residue that may be difficult to clean.
If having troubles just leave a question ill be happy to help.
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