Some while ago Ernie mentioned that limonene is a really good cutting fluid for machining aluminum.
Just for the heck of it I bought a bottle of "Goo-Gone". The label doesn't say what's in it other than some mention of "citrus power". Maybe limonene?
I tried it for turning and parting off aluminum, probably 6063, with HSS toolbits. It worked very nicely (better than Tapamatic I think), left a nice finish, it's cheap, readily available and it even smells good.