The easiest way to clean a cat carrier is by using mild soap and warm water for both hard-sided and soft-sided carriers. For hard-sided carriers, scrub all surfaces and rinse thoroughly. Soft-sided carriers, if machine washable, can be laundered according to manufacturer instructions; otherwise, hand wash and air dry. Disinfecting with a pet-safe disinfectant after washing can help eliminate germs. Cleaning should be done after each use to prevent odors and bacteria build-up, ensuring a clean and comfortable environment for your cat during transport.