To remove tear stains from a cat, you can first try gently wiping the eye area daily with warm water or a diluted saline solution. Consistent use over time should show improvement. If the tear stains are severe or stubborn, you can use a specialized tear stain remover, but be sure to follow the instructions carefully and avoid getting it in the cat's eyes.

At the same time, pay attention to dietary adjustments, choosing natural cat food and avoiding excessive salt and additives. If tear stains persist, it is recommended to consult a veterinarian to find the root cause and resolve it.