Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to clean gunk off of an optical computer mouse [title] Gather your equipment. [step] To clean your optical mouse, you will need the following items : [substeps] Q-tip or microfiber cloth-for cleaning gunk off of the mouse. If possible, use a microfiber cloth since it won't leave behind fibers like a q-tip will.

Ending1: Microfiber cloths are often best because they are extremely absorbent and don't leave behind scratches. Q-tip abrasion-while using a q-tip on hard-to-reach areas, it can break glass. Ending2: Gentle rubbing cleansers: to start, buy rubbing alcohol with the oil of your choice. Q-tips are best if using items like gunk off of a battery. Ending3: Isopropyl alcohol-for cleaning and sanitizing. Do not use a different cleaning agent (e.g., windex)-if you don't have isopropyl alcohol, use water. Ending4: Brush out the gunk-removing chemicals from the gunk. You'll need a microfiber cloth as well.

Answer format: ending1/ending2/ending3/ending4