Shampooers are machines designed to clean carpets and upholstery by applying a mixture of water and cleaning solution. They work by spraying the solution onto the surface, agitating it to loosen dirt, and then vacuuming up the dirty water. This process helps to remove stains and refresh the fabric. There are various types of shampooers, including portable models for small jobs and larger, more powerful machines for extensive cleaning. Some shampooers are designed for home use, while others are used in professional settings, such as by cleaning services or carpet retailers.