Please choose the correct ending to complete the given sentence: Health: [header] How to care for a monocular [title] Wipe off the lens. [step] A monocular has two lenses: the ocular lens (which you put up to your eye) and the objective lens. You should keep both clean to ensure maximum visibility.

Ending1: Take the lens off and, using a soft cloth, wipe off all debris. [substeps] If you use the objective lens, wipe the lens once it's cleaned. Ending2: Cloth wipes are best for delicate, coated lenses, like those on a monocular. You can use a microfiber eyeglass cloth, a cotton ball, or a cotton rag. Ending3: Wipe both lenses off with a cotton ball. Place your lens in your ocular or objective eye socket until it is completely clean. Ending4: If you are unsure how to clean your ocular lens, you should contact your optometrist to see. [substeps] The objective lens is the smaller lens, which you put up to your eye socket to polish.

Answer format: ending1/ending2/ending3/ending4