Which of the following techniques is commonly used in carpet cleaning?

Hot water extraction is a widely recognized technique in carpet cleaning and is often considered one of the most effective methods for deep cleaning carpets. This technique involves using hot water, which is typically mixed with a cleaning solution, and applying it to the carpet fibers. The hot water helps to loosen and dissolve dirt, stains, and allergens that are trapped deep within the carpet.

After the hot water is applied, a powerful vacuum system extracts the water along with the dislodged contaminants. This method not only cleans the fibers thoroughly but also helps in sanitizing the carpet, as the heat can kill certain bacteria and allergens. The combination of heat, cleaning agents, and powerful suction makes hot water extraction particularly effective for a variety of carpet types and conditions.

While techniques like dry cleaning, spray and vacuum, or brushing may serve specific purposes or be suitable in particular scenarios, they do not offer the same level of deep cleaning and extraction as hot water extraction does. Therefore, it is the preferred choice in many professional carpet cleaning operations.