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Thoroughly wipe the grey area on the inside cover. Clean both sides of the test strip holder base, especially around the hole. Dry the test strip holder completely with a soft cloth or lint–free tissue. Cover Top of Base Bottom of Base Inside Cover Grey Area Hole (clean both sides) Base 42 3. Dampen a cotton swab or soft cloth with water and wipe the lens area and contact points with it. Do not scratch the lens area. Dry with a soft cloth or tissue that does not contain lint, lotion, or perfume.