As it is a maintenance procedure, i.e it is in the maintenance manual, you may want to contact your maintainer!
PWC 71-00-00 POWER PLANT - CLEANING
ECD 71-65-00 7-1 Cleaning Engine Compressor
Depending on the aircraft it may involve removal and blanking of the bleed air lines. Some A/C have optional quick disconnect bleed lines. Reason being that you do not want compressor wash goop in the BA heater and subsequently in the cabin.
Read up on PWC's policy with the difference between desalination rinse and performance recovery wash. They recommend a recovery wash only if it needs it as determined by power check / trend.