Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to potty train pet rats [title] Start by saving a tablespoon of droppings out of your rat's old cage. [step] Set it aside to put in the litter box, making sure the spoon carries no scent that could distract your rat from the litter box. [title] Clean your rat's cage thoroughly.

Ending1: [step] Disinfect a sponge, toilet paper, puppy ball, or white cloth mop with 50% non hydrogen peroxide. Soak the mop in water for twenty seconds, and clean the poop with the damp sponge. Ending2: [step] Though there are no regular cleaning and feeding rituals necessary for a rat to begin with, having at least once a week clean the cage will give your rat a fresh start in its new home. [substeps] During the cleaning, dust the cage with a microfiber cloth. Ending3: [step] Put in fresh bedding and disinfect any toys or houses that might have dropping on them. [title] Take a small, shallow box and put it in the corner where your rat generally does his duty. Ending4: [step] Clean the bathroom table using a disinfectant so as not to rub it down. And clean out a litter tray to catch any droppings or urine.

Answer format: ending1/ending2/ending3/ending4