MIL-T-5842B, MILITARY SPECIFICATION: TRANSPARENT AREAS ON AIRCRAFT SURFACES (WINDSHIELDS AND CANOPIES), RAIN REMOVING AND WASHING SYSTEMS FOR, DE-FROSTING, DE-ICING, DEFOGGING, GENERAL SPECIFICATION FOR (29 MAR 1985)., This specification establishes the requirements for systems which keep transparent areas, on aircraft surfaces (windshields and canopies), clear of ice, frost, fog, rain, salt, snow, insects, dust, gun gas residue and grease. These systems are inherent to the aircraft, but can be ground applied.