What solvent do you guys use?

[crawdad]

Not quite sure where to post this, but I bought a solvent tank and some "water base" solvent from Northern not too long ago, and I am really put out with the solvent . The solvent came in a 5 gal bucket that you mixed with water (probably the biggest problem) and it want cut any kind of oil or grease. I've been tempted to get some regular petroleum based solvent, but the tank says to use water based only because of the electric pump. Just wondering what you guys are using and how good a job it does? Can anyone recommend a good water based solvent?