Water Works Heavy Duty Degreaser Concentrate 1 Gallon

For the parts cleaner, this is the degreaser I have been using. Since this is the first parts cleaner I've ever owned, I don't know if this a good or poor option but it claims to be largely biodegradable and seems to work quite well.

The parts cleaner (see tools) can hold four gallons but apparently needs over two so that the pump pickup will work.