Ask about cleaning techniques. Hot-water extraction, sometimes called “steam cleaning,” is the most common technique professional carpet cleaners use and the method recommended by many carpet manufacturers.

Synthetic polypropylene carpet is cleanable with a 50% bleach, 50% water solution. All 100% polypropylene carpet is bleach cleanable, whereas most other carpet types are not to be cleaned with bleach or harsh chemicals and can be damaged if cleaned with strong chemical solutions.