On time carpet cleaning uses our green carpet cleaning shampoo which contains no chemical that would degrade or harm the fiber or dye of your rug. Regular shampoo leaves a sticky residue that attracts dirt and resoils the carpet. They can also contain color brighteners so while they make the carpet brighter and cleaner after washing, after time they degrade and can create a yellow tinge in your carpet. Green Choice green cleaners do not contain any brightener or chemical that would harm your carpet. On time carpet cleaning shampoos are applied our shampooers agitate the cleaners deep into the carpet to lift out the dirt and stains by trapping it in the foam. Finally we use special vacuums to suck the shampoo up leaving your carpet restored to original beauty.