Thought I'd update this......
The transmission in my pickup grenaded a few weeks ago, prompting me to replace the grubby six-year-old soup in the parts cleaner for the rebuild.

Found that wally has dropped the price of paint thinner to $6.24/gal...... bought a few and the old stuff will be recycled - my buddy down the road has recently acquired a solvent still. That 13 gallons of yuck will turn back into nice clean solvent and a little black brick in a baggie.


When I use carb spray on parts, it usually gets done over the tub - the stuff is mostly acetone and it mixes just fine.
Just for giggles, I called a local oil/fuel distributor - was quoted $36/5gal. bucket or $255/55gal. drum for 'cleaning solvent'.