Back when I first got my R-12 Cert. in the early '90's I remember seeing this additive called "Maxi-cool" in auto parts stores. I tried it and it seemed to make the air cond. cool better and it did lower the outlet air temp in cars with the old r-12 system. I have no idea what the stuff was, but it smelled just like rubbing alcohol, and it would catch fire with an open flame. Anybody know what this stuff really was? or how it worked? Was it just me wanting it to work, or did it do something?