Clouded camera lens?

[jeleser]

The black rotating piece that adjusts the focus on the camera for our robot was recently broken and wouldn't attach. We superglued it back on, and a bit of residue was lining the outer edge of the lens. Somebody saw this and tried to clean it (I'm assuming by wiping it with a cloth), and the residue was spread across the camera lens. We tested the camera and it's virtually useless unless we can clean the lens. We tried rubbing alcohol, and have yet to test the image, but the lens looks too covered with the residue for that to have worked. Somebody recommended trying Goo-gone, is there any potential for that to damage the lens?