During Vietnam years we were to wash our Chinook engines at the end of every flying day so as to keep the "Bleed Bands" clean. The procedure was to pull up to the water bowser, crew chief or gunner would fill a bucket, then with great care and caution....(think door gunner here)....fling ladle fulls of the clean water into the engine intake as we used the Emergency engine trim system to pull the N1 into the range where the bleed bands would open.
In time...after long days of flying....ten plus hours....the procedure was reduced to chucking near bucketfuls into the intake. The engines bogged down a bit but never died on the spot. Perhaps hours later while in flight maybe...but not on the hard stand.
The alternative method during rainy season morphed into finding a pouring down column of rain, enter autorotation, pull the N1's down into the correct range....repeat three times while in descent...then carry on with the day's business.