Firstly: good landing and job well done, especially from 600': pat on the back.
Second:
Comp washes: I had to pin this down during my time with the National Police EC135 User Group. Talking with the Turbomeca and PandW reps, the following is a technical requirement. Failing to comply will render engine turbine/nozzles and associated hardware warranties, null and void:
Salt laden atmosphere as recognised by RR, TM and P&W: up to 150 miles inland. IE: The whole of the UK.
Comp was MUST be done after last flight of the day. It is acceptable for this period to roll over to 'prior to first flight of the day'.
Comp wash must be done i.a.w. manufacturers recommendations. (Usually a timed run with a minimum amount of fluid thru the cent/axial/Power turbines.
Fluid used: MUST be distilled water! Tap water has too many contaminants and the contaminant level must be less than 20ppm.
Eventually we devised a trolley mechanism which when attached to the engine bleed valves, could be operated by ONE person from the pilots seat as they crank the motor over for the recommended time period. The kit even converted tap water to distilled water within minutes.
To be fair to the OEM's - the amount of accelerated wear and tear by NOT doing it is blatantly obvious after paying a visit to their workshops before and after or with and without comp washed engines.