well...

there are the sprays.

and there are the soaks,

there are acid, and non acid.

it really depends on what is on your coil, and if you can remove the coil for cleaning, or if it's staying in the car for the cleaning.
you would not want to spray an acid cleaner on the car... you'd stand too great a chance of having some get in the frame, and rust out from the inside...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!