High quality lens paper is essential to preserve your investment in microscope optics. The optical surfaces of the microscope may be cleaned with lens paper wrapped around a cotton applicator. Wipe with a gentle circular motion. Using Olympus clean lens paper, gently blot off the oil from the lens. Do not rub with any force . Do NOT drag the paper across the lens, just dab off the oil. The front lens of the objective is very delicate and must be protected from scratching.