Specifically designed for use in the airline industry. In conformity with Aerospace Materials Specifications AMS 1613A ��_��__��_��__��_��__Carpet Cleaner, Water Extraction Type," Crystal Blue is intended for use use on stain-resistant nylon carpet and upholstery. A phosphate-free blend of powerful surfactants, builders, and corrosion inhibitors, this liquid alkaline extraction agent can be used in residential and commercial applications.