Parts Washer Recipe?

I just bought a 20 gallon parts washer and am looking for what everyone uses as their cleaning mixutre. It has to be between 6 and 8 PH so I can't use my degreaser bath that I planned on using. It'll be used for cleaning up the old greased parts I have sitting around.

It specifically says not to use diesel or kerosene for the flammability, but I'm not hugely concerned cause it's 50% kerosene 50% degreaser. Just wasn't sure if the PH level was around 6-8 or not