Before using phones or keyboards, wash your hands well to avoid passing germs onto them from the oil and sweat on your fingers. Clean the appliances when they are not switched on. Avoid eating, combing your hair or biting your nails over the keyboard. Every now and then, turn the keyboard over and shake it over the wastepaper basket to remove loose dust and debris. Wipe the keyboard and mouse with a damp cloth. Avoid using detergents, particularly on computer screens. Damp paper is sufficient. There are also special cleaning materials on the market. Use compressed air to clean the keyboard and inside computers, or even an ordinary hair dryer. Take care where you direct the air flow so as not to damage the circuits. Mobile phones can also be cleaned with a damp cloth. You can clean carefully between the cracks with cotton swabs or a toothbrush.