Not terribly effective.
It did clean off some surface rust, but not significantly enough to recommend it. The experience was borne of this thread for anyone not following it.
I ended up leaving it in the tank a little longer than initially planned (about 2 1/2 days) since I didn't time it well with my work schedule and it was cold out, so I figured after researching that without heat, more time would be better and wouldn't hurt anything. I would have dumped and flushed and added the second batch, but I didn't see enough of a difference (but some) to keep at it. I'll save that batch of Coke for cleaning my chrome - heard it works great.
Some rust dissipated, but not really enough IMO opinion to use it. Probably be great for a basic cleaning, followed by flushing with water, flushing the petcock, rinse, repeat, dump, rinse repeat, etc and drying with a hair dryer or heat gun. The good part is that it did remove and loosen some corrosion, cost very little and did no harm.
So it would have been a really cool story if it had worked, but since Coca Cola is often used for cleaning just about anything (phosphoric acid, ph of 2-3) I'm guessing many before me have tried it and it probably didn't work. Guess Coke still goes better with Jack than old gas and rust!
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