I used some second hand coolers once, and the trans shop who rebuilt my trans sold me a couple of aerosol cans of "flush" stuff.
The cans had a bit of hose attached to them that fits onto the cooler input etc, all I had to do was blow that stuff through.
no idea what they were called sorry.
You could get a couple meters of hose attached to the cooler, fill the hose with wax and grease remover, then put the air duster into the hose and blow it through.
And repeat until it comes out clean as.
Might pay to start with petrol as it is cheaper, then flush it all nice and clean with the expensive stuff at the end.
Be careful it does not blow back in your eyes though.
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