I bought a screen protector for my DS touch screen. I saw bubbles on the first application, so I removed it a little and tried again, but they were still there, so I decided to remove the screen protector all together. When I did, it left residue on my screen from the bubbles and some all around the edges of the screen. Now, how do I remove the residue? Can I use Goo-Gone ( is it safe?) or should I use cotton swabs and rubbing alcohol instead? please help!