HRL, I've use the 50/50 acetone and ATF for many years. It does work extremely well and better than PB Blaster. The only drawback is that it isn't in an aerosol container so spraying it into small , hidden crevices doesn't work as well. For soaking or applying to easily accessed areas, it's great. I have put it in old Windex style bottles but you can't get that tight little spray like you get with one of the red straws on a can.
Be sure and use Dexron on GM parts and Type F on Ford parts.
