Ignoramus8543 fired this volley in
:

I have a particular machine where soluble oil/metalworking fluid has
dried out in the sump. How do I remove the dried out stuff to prevent
clogging of the fluid system with the remnants of the old dried out
stuff.

Hot TSP solution will not only soften and remove the old stuff, but also
clean the metal of the tank.

Make up a strong solution -- say a cup TSP per gallon, and heat it up to
near-boiling, either in a separate pot or in the tank with an immersion
heater. Let it work for as long as you can stand. A couple of days of
soaking will get it all pretty much limbered up and removable.

Lloyd