Leopards are sensitive to their environment, and it's important to use cleaning products that are designed specifically for use with animals. There are a variety of commercially available pet-safe cleaning products that can be used to clean a leopard's dishes and hide tank without causing any harm. These products are designed to be non-toxic and safe for use around animals.
Overall, it is best to avoid using Dawn dish soap or any other household cleaning product on a leopard's dishes and hide tank. There are pet-safe cleaning products that are specifically designed and formulated for animals.