There are 4 components to clean carpet. Heat,chemical,agitation and time. When one component is not sufficient,  you have to increase another component to get the carpet clean. For example, to compensate for a lack of heat, more chemical would be used.Have you ever had your carpets cleaned only to get dirty spots a week or two later? This was because too much chemical was used and it left a residue. Our process will get most of the soapy residue out, leaving your carpets fresh, soft and they wont get those dirty spots after we leave.