As with an aquarium you have to clean the inside of your computer screen. For an aquarium you can obtain various devices to undertake this task, for example a magnet with felt or sponge attached. For the inside of the computer screen this is more difficult. However, a clever manufacturer has created the perfect tool: click on the link below and move your cursor... Make sure it is all very clean!! http://mirrored.flabber.nl/boob.cursor/ciagnijcycka.swf