I think the method of applying a damp cloth to the area and then turning the screen on would work,because I had a problem with stuck pixels on my Gameboy Advanced, and I tried that method, and it did the trick. Just keep in mind that it will be likely that you will have to disassemble the Gameboy to properly get to the screen, because of the plastic shield.

Microsoft explained it in their documentary about the Xbox 360.

https://www.youtube.com/watch?v=z2d6IMBS...