"Lloyd E. Sponenburgh" lloydspinsidemindspring.com fired this volley in
. 3.70:

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.

PS... it's not only dried, but oxidized to a varnish. Varnish is not
water-soluble. But strong, hot TSP solution is ALSO a "varnish remover"
G.

Lloyd