Today I ran a 1/2" chisel into a screw, which gave me an excuse to sharpen it and correct some preexisting issues with the edge. I have been using DMT diamond stones.

The last time I did this, I used WD40 as a lubricant. It was handy. Later I realized that when the liquid evaporated, the wax in the WD40 was still on the stone, causing problems.

I am wondering if anyone can recommend something better. I tried to find kerosene today, figuring it would be a lot like WD40 without the wax. I ended up using lighter fluid, which worked very well and instantly dissolved the wax. The stone cut like crazy. If no one has a better idea, I'll keep using it.