Why do toilets in some restaurants have a similar smell instead of a bad smell?

People who work in the clubhouse said that because the air conditioner is always on, and our toilets here usually put perfume or incense. Put ice cubes in men's urinals to reduce odor. If you are at home, it is recommended to take a sip or put perfume, which is the kind with perfume in the bottle and a few bamboo sticks inserted to give off fragrance.