We are located in Westchester County, New York and have patented a compressed air and vacuum condenser coil cleaning process for stand alone commercial refrigeration appliances. It relies upon the COILPOD dust hood to trap the blown off dust and debris from the coils when they are cleaning. I can be used with a standard wet/dry vacuum equipped with hoses on the exhaust port and the suction port, respectively. See U.S. Patent No. 10,081,038.
Our patented COILSCRUB concept is a potential way of preventing coil fouling by employing an air pre-cleaner apparatus on the cover over the condenser coil enclosure to pre-scrub the dirty airflow entering that enclosure. It is awaiting testing and further development work. See U.S. Patent No. 10,816,260.