Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to clean a rat's cage [title] Wash your rat's cage on a regular basis. [step] Spot clean soiled areas daily and clean the entire cage at least once a week. If you start to notice an ammonia smell, you've likely waited too long.

Ending1: Give the cage another thorough cleaning every week or so to ensure it has a good finish. [substeps] If you have a stubborn rat, clean his cage once a week, or every other time. Ending2: Keep track of which areas are dirtier and which ones are more dirtied. [substeps] Cleaning your rat's cage at least twice a week is ideal because if you're not sure where to start removing more expensive disinfectant than fresh solution, do it first. Ending3: Set up a cleaning schedule so that ammonia never injures your rat. [substeps] Natural rat litters made from materials like hay/straw and aspen wood shavings will need changing more often. Ending4: [title] Pour soapy water over the entire area. [step] Sprinkle a few drops of the soap on the rats' cage floor.

Answer format: ending1/ending2/ending3/ending4