Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to make piercing cleanser [title] Add two small drops of tea tree oil to the mixture, using a small dropper. [step] The purpose for this is because tea tree oil is a natural anti-septic, and it will further kill any infection/germs/bacteria in the piercing, or on the jewelry and skin itself. Also, it adds moisture to the skin around the site, to avoid peeling and dry, itchy skin.

Ending1: If you don't have any tea tree oil, you could use olive oil instead. [title] Ensure that there is no ring around the piercing. Ending2: It also adds a nice scent to your cleanser. [title] Add a small amount of vegetable glycerin to the bottle. Ending3: [title] Put the drops of tea tree oil into a bowl. [step] A fan or open-mouth spray will work the best. Ending4: Get a small bottle of tea tree oil from the store, and add it to a small measuring cup. A measuring cup contains water and a small spoon.

Answer format: ending1/ending2/ending3/ending4