I noticed that Bill Hirsch makes a parts wash solution. I've never tried this product, but every other product I've used from this company was very high quality.
From web site:
Powerfull formula, enviornmentally friendly.
For use in parts washers, dip tanks etc. Can also be sprayed on.
One gallon makes four gallons of the best parts wash you have
ever used. Completely re-useable. Non-flammable and biodegradeable.
A must for every garage and restorer.
Not recommended for use on aluminum
$21 / gallon
http://www.hirschauto.com/prodinfo.asp?number=4001