Cyclean is used on our Trent 800 900 and 1000. Benefits, yes, a reduced fuel burn and slightly lower egt. The engines require a low power engine run afterwards to dry everything out and check for any messages.
The GE90 base and the 115 the 'juniper' rig is used, the spray nozzles being hooked behind the fan spraying water at IIRC 70c into the booster section. However the engine needs the FADEC lines disconnecting and blown thro' with nitrogen afterwards and also the base engine needs high power engine runs to get water out of the oil system and an oil filter change.
Only ever done a few RB211-524 as a trial, no real benefit found but then again that engine has the best performance retention over its life than any of the others!
