When interviewing any potential carpet cleaner, be sure to inquire whether they utilize a truck-mounted steam cleaning system, as this question should be asked of any prospective business. Too many so-called professional services use methods not recommended by manufacturers and can actually cause irreparable damage. Companies claiming no residue cleaning mean that soap was not put into the carpet - this does not indicate hot water extraction for proper carpet care, which all manufacturers endorse as the solution for optimal carpet care.