Care must be taken with wet methods. Over saturation causes shrinkage and seam splitting. Drying time can extend from several hours to a day or more. The operator must be skilled and have experience to understand the relationships between soil conditions, humidity and the amount of moisture to apply to avoid over wetting.
A vital part of this process is the extraction of the water solution any detergent left will attract soiling making the stains reappear within a few days. For best results a professional cleaning company should always be used.