Quoted from vid1900:Check your label carefully.
"The Works" that they sell at my local store is Chlorine based - the opposite of what we need.
HCl = Hydrogen chloride - one atom of hydrogen, one of chlorine. Mix it with water and you get Hydrochloric acid.
http://content.rpgov.net/dpw/right_to_know/Libary/The%20Works%20Toilet%20Bowl%20Cleaner.pdf