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Put the front of the movement up, pull out the disc tray, you can already see the optical head assembly, the top soybean-sized glass sphere-shaped transparent body is the focusing lens, now you can already use a cotton swab dipped in a little anhydrous ethanol to clean the focusing lens. Before cleaning the focusing lens with a magnifying glass to look closely at the surface of the focusing lens, you may see dust or foggy piece, with a degreasing cotton wool or lens paper gently wipe away the dust on the surface of the lens, a little more than a few times, you will return you to a clear and bright mirror. Focusing lens is mounted on the elastomer, wipe can be slightly more force, but too much force will cause displacement or deflection of the lens will affect the reading of the disk. Do not use tweezers to avoid scratching the lens surface. Do not touch the focusing coil on the side of the focusing lens. Cleaning of the optical head is required to clean the liquid, with what cleaning fluid industry has been debated. The author believes that in general, do not have to use cleaning fluid. If the dry sassafras can not remove the dirt, and then consider using cleaning fluid. Water cleaning is absolutely not. Can use alcohol to clean the laser head of the issue is also debated, the author believes that the use of high-purity anhydrous ethanol is perfectly fine. The so-called alcohol usually refers to an ethanol solution containing water and impurities. Therefore, alcohol is indeed not suitable for cleaning laser heads. Anhydrous ethanol is a nearly neutral weak organic solvent, its purity from low to high can be divided into: industrial purity, chemical purity, analytical purity, spectral purity of several kinds. The higher the purity, the less water and impurities. The optical head of the optical drive consists of a laser generator, photodetector, focusing lens, laser beam separator, servo motor components. The most dusty part is the focusing lens located underneath the optical disk, and cleaning in general refers to cleaning the surface of this lens. The surface of the lens is coated with a thin film, called the permeability enhancement film, whose material is magnesium fluoride. The main function of the permeability enhancement film is to reduce refraction and increase transparency. Magnesium fluoride is not soluble in ethanol, but magnesium fluoride is prone to moisture absorption and deformation. Due to the analytical purity of anhydrous ethanol grade, containing water and impurities has been very low, volatility is very strong, able to dissolve organic impurities, and for the permeability enhancement film will not cause damage. Therefore, the author believes that the use of high-purity anhydrous ethanol to clean the optical head lens is possible. In the actual overhaul work, this did not cause damage to the lens surface film. The use of water to clean is not desirable, because magnesium fluoride is easy to absorb moisture after deformation, and more impurities in the water these may cause damage to the permeability enhancement film, so that the optical drive can not work properly. Similarly, alcohol with more water and impurities is not suitable for cleaning the laser head.