MIL-PRF-85704C, PERFORMANCE SPECIFICATION: CLEANING COMPOUND, TURBINE ENGINE GAS PATH (15 JUL 1998) [SUPERSEDING MIL-C-85704B]., This specification establishes the requirements for three types of turbine engine g compounds, two are used for off-line (starter cranked) engine cleaning operations and one is used for on-line (fired) engine cleaning (See 6.1).