How do they make rental cars smell like new?

The ';new car smell'; air fresheners don't really smell like the real thing, but rental cars always do, no matter how old they are. What do they use?How do they make rental cars smell like new?
Maybe they spray them with formaldehyde which is used in the manufacture of many of the carpet and upholstery materials used in new cars. It's also what undertakers use to preserve dead people and it can cause breathing problems. It is the source of the ';new'; car smell. Some people are seriously allergic to it.How do they make rental cars smell like new?
They're usually kept VERY clean. Smoking in the rental cars is usually not recommended by the companies, so the stink from any kind of smoke doesn't get into the fabric of the interior.
They have ';new car'; sprays as well as air fresheners.
air fresheners that smell like new cars.