I have a 15-gallon, home-built parts cleaner in my shop that is doing just
fine.

Recently, at a lawn sale, I had the chance to purchase one of those small,
3.5 gallon parts cleaners like you see in the Northern Tools and Harbor
Freight catalogs brand-new-in-the-box for $12.00.

Thought it would be ideal in the race car trailer for use at the track.

In reading the one page info sheet that comes with the unit, it specifies
for use with "oil-based solvents ONLY!"

Interestingly, on the N/T website, it recommends a water-based cleaning
solvent to go with this cleaner.

Given the number of unplated, unpainted surfaces inside the parts cleaner,
I would suspect that water-based cleaners would wreak havoc with the
machine.

If you are buying one, and the "sales" person suggests some cleaner to go
with it, be very careful.