Source: http://www.housecleaning-tips.com/carpet-cleaning-tips.html

Carpet Cleaning Tips - Your carpet cleaning supplies.

Carpet cleaners can be mild or very strong. Most contain chemicals which are highly dangerous like, hydrofluoric acid, tetrachloroethylene and butoxyethanol.
When using these products please read the manufactures instructions carefully and take the necessary precautions like wearing gloves and using goggles.