Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to clean an oxygen sensor [title] Protect your hands and eyes. [step] Since you'll be dealing with gasoline and various car parts, it's important to protect yourself from potential harm. Before you begin to lift your car and locate the oxygen sensor, put on a sturdy pair of work gloves to protect your hands.

Ending1: You should also wear a pair of protective eyeglasses or goggles in case any wd-40 or gasoline comes near your eyes. [substeps] Both work gloves and protective eyewear can be purchased at your local hardware store, or at a large retail store such as a walmart. Ending2: Any material which might snag your gloves can tear. [substeps] Avoid wearing metal gloves that will harden as the materials get wet. Ending3: Wear a short sleeve shirt under your work gloves, a long sleeved shirt under your work clothes, and work boots and a belt. [substeps] Attach a tourniquet to your oxygen sensor before using it. Ending4: Under normal circumstances, there is a chance that gasoline will stain your skin. Shower immediately after you're done lifting the car.

Answer format: ending1/ending2/ending3/ending4