This has been posted before - it's one of those urban legend thingies that keep getting tossed around. Hoax-a-rama.

From http://www.snopes.com/cokelore/acid.asp :

Many of the entries above are just simple household tips involving Coca-Cola. That you can cook and clean with Coke is relatively meaningless from a safety standpoint -- you can use a wide array of common household substances (including water) for the same purposes; that doesn't necessarily make them dangerous. The fact is that all carbonated soft drinks contain carbonic acid, which is moderately useful for tasks such as removing stains and dissolving rust deposits (although plain soda water is much better for such purposes than Coca-Cola or other soft drinks, as it doesn't leave a sticky sugar residue behind). Carbonic acid is relatively weak, however, and people have been drinking carbonated water for many years with no detrimental effects.

The rest of the claims offered here are, in a word, stupid. Coca-Cola does contain small amounts of citric acid (from the orange, lemon, and lime oils in its formula) and phosphoric acid. However, all the insinuations about the dangers these acids might pose to people who drink Coca-Cola ignore a simple concept familiar to any first-year chemistry student: concentration. Coca-Cola contains less citric acid than orange juice does, and the concentration of phosphoric acid in Coke is far too small (a mere 11 to 13 grams per gallon of syrup, or about 0.20 to 0.30 per cent of the total formula) to cause harm. The only people who proffer the ridiculous statements that Coca-Cola will dissolve a steak, a tooth, or a nail in a matter of days are people who have never actually tried any of these things, because they just don't happen. (Anyone who conducts these experiments will find himself at the end of two days with a whole tooth, a whole nail, and one very soggy t-bone.)

The next time you're stopped by a highway patrolman, try asking him if he's ever cleaned blood stains off a highway with Coca-Cola. If you're lucky, by the time he stops laughing he'll have forgotten about the citation he was going to give you.

(End of quote)

Now, on the other hand, consider the dangers of water:

(From http://mmd.foxtail.com/Archives/Dig...7.07.31.11.html )

Dihydrogen Oxide (DHO) is colourless, odourless, tasteless, and kills uncounted thousands of people each year. Most of these deaths are caused by accidental inhalation of DHO, but the dangers of Dihydrogen Oxide do not end there.

Prolonged exposure to it's solid form causes severe tissue damage. Symptoms of DHO ingestion can include excessive sweating and urination, and possibly a bloated feeling, nausea, vomiting and body electrolyte imbalance.

Not only is DHO dangerous to humans it is also extremely hazardous to the environment. It is a major component of acid rain, it contributes to the greenhouse effect, and is a common cause of erosion of our natural landscape.

Worldwide contamination by DHO is reaching epidemic proportions. Quantities of the chemical have been found in almost every stream, lake and reservoir in Australia today. But the pollution is global, and the contaminant has even been found in the Antarctic. So far governments and environmental watchdogs have been indifferent to the problem.

Despite the danger DHO is widely used as an industrial solvent and coolant, in nuclear power stations, as a fire retardant, as an additive in certain junk foods and other food products, and in a wide variety of other uses. Companies routinely dump DHO into rivers and oceans, and nothing can be done to stop them because this practice is still legal.

The Australian government (In fact no government) has refused to ban the production, distribution or use of this damaging chemical due to its 'importance to the economic life of the nation'.

In fact the U.S. Navy and other military organizations are conducting experiments with DHO, and designing multi-billion-dollar devices to control and use it during warfare situations. Hundreds of military research facilities receive tons of it through a highly complicated underground distribution network. Many store huge quantities for later use.

Act now to prevent further contamination.

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