FWIW: I used to install access control and commercial security systems. Many, many a hole drilled into aluminum storefront mullions. BAR SOAP!! seriously, the cheapest bar of soap you can find, just a dab on the drill bits, and the aluminum comes off easily, or just tends to not stick.
Picked this one up from the framers, who would treat their chopsaw blades with it, prior to cutting steel studs, or the aluminum storefront extrusions.