If the visual appearance of a cat urine stain is annoying, what about its smell! However, there are ways to easily clean these stains.
If the urine is still fresh, try to wipe up the liquid as much as possible with a paper towel.
Pour a light coating of baking soda on the surface of the stain. Leave to absorb for a few minutes.
Then clean the surface by tapping with white vinegar and then rinse.
There are many methods that work more or less well to eliminate the stain.
You can also use hydrogen peroxide diluted in water .
CAUTION: Do not use ammonia or bleach as this will attract the cat and he will come back to urinate there.