Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to clean dog collars [title] Mix baking soda and water. [step] Stir in a small spoonful of baking soda into hot water until it dissolves. This mixture can be used to clean all common types of dog collars.

Ending1: Mix together 1 teaspoon baking soda , 2 teaspoons warm water, and 1 teaspoon lemon juice for a basic cleaning product. [substeps] Fill a spray bottle with warm water and bring the water to a boil. Ending2: Because certain types of collars require a special process, get special cleaning products that contain baking soda. [substeps] Mix together baking soda and water until two gallons (2.8 l) are used. Ending3: [title] Apply the mixture to your dog's collar. [step] Make sure that there is a thin layer of the mixture on the collar, as this prevents it from frizzing up too much. Ending4: [substeps] Always remove the collar from the dog before cleaning. [title] Scrub the dog collar with this mixture.

Answer format: ending1/ending2/ending3/ending4