Simple Green is an incredible, all purpose, non-toxic, bio degradable, water-based all purpose cleaner. I discovered many years ago that if you dilute it: 50% water/50% Simple Green is makes for a fantastic, economical cutting fluid. I use it on the drill press for metal cutting and I use it with my DMT Diamond Stones for tool sharpening.

I buy it by the gallon at Home Depot, but you can also buy it online at Amazon.com.