Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to make dog shampoo [title] Wash your dog with dish soap, vinegar, and glycerin. [step] A simple, all purpose dog shampoo can be made using one cup of dish soap, one cup of apple cider vinegar, and 2 ounces of glycerin. Glycerin is a form of sugar alcohol you can purchase online or at a drug store.

Ending1: It will really help with greasy dog hair. [substeps] When using this shampoo, make sure to combine ¼ cup vinegar with 2 ounces of glycerin. Ending2: [substeps] Mix one teaspoon of all purpose dish soap with one quart of warm water. Stir this mixture of tea tree oil and apple cider vinegar into a bowl of warm water. Ending3: [substeps] Do not use human facial cleansers as the ingredients in your dog shampoo may repel harmful bacteria. [title] Use pure dog shampoo and warm water. Ending4: You will also want jars to mix your shampoo, and an empty shampoo bottle to put it in when you're finished. [substeps] Pour all your ingredients into a jar, making sure to pour the dish soap first.

Answer format: ending1/ending2/ending3/ending4