A dirty camera surface can make it harder to see what's happening. Before wiping it, identify the surface you're cleaning and check the instructions for your model. The part in front of the camera may be a protective window or dome cover—not an exposed lens. Keep cleaning to accessible external surfaces. Don't open the camera to reach the lens, and don't assume a cleaner or tool is suitable just because it's labeled for lenses. Lens, protective window, or dome cover? An exposed lens, a protective front window, and a dome cover are different surfaces. Their materials...