Fluid is fluid. Normally you would want to flush your coolers with what your normal fluid is. Pressurize the system and flush away. Have to have some sort of filters to catch the bad stuff. Now the kerosene will cut the oil sludge that is in the cooler and flush it out when you dump it. All those microscopic pieces are the hard ones to get but it will work.
Water will do some of this. Not as well and will mostly float over the oil sludge that is built up inside. But it will get the big chunks out and then on to the other stuff.
I flushed many a hyd system on jets and god knows how many times on the radar cooling systems. There was a little easier since we had GSE to support the flush and fill.
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