Orion 331 R of M/ s Oriental chemicals or VC- 601 of M/ s Vinni chemicals Cleaning Compound for all Ferrous Components like cylinder heads, Exhaust & inlet valves of cylinder heads, compressor valves, nozzles tips etc of RDSO Specn. No. MP. 0. 8000. 02 ( Rev.- 00 ) August- 08, to RDSO Report no. MP. MI- 15 ( REV. 13 ) May 2023 Page13.