Here's the reply from Simple Green
Dear David,
Thank you for choosing Simple Green!
Simple Green Cleaner/Degreaser/Deodorizer & Crystal Simple Green Industrial Strength Cleaner/Degreaser should work great for your parts washer. Both are aqueous based cleaners. They are both non-toxic, biodegradable & non-flammable. The differences between the two products is that Regular Simple Green has a Sassafras Scent, and Crystal Simple Green has no added scent or dyes. Also, Crystal Simple Green is a stronger cleaner due to the fact that it contains no dyes or added scents. Crystal is also great for more critical cleaning, such as electronic components.
Both products are available in 5-gallon, 15-gallon, & 55-gallon containers.
She followed up with contact information in my area to buy this stuff in bulk. Not Bad.