Every bottle has the exact same ingredient list, which makes me a little wary. Because I couldn't decide a better place in theto put this, I'll list it all here here.
The full ingredient list: Water, Glycerin, Flavor (aroma), Potassium Acesulfame, Carbomer, Sodium Hydroxide, Diazolidinyl Urea, Sodium Benzoate, Potassium Sorbate, May contain: Caramel, Red 40 (CI 16035) Red 33(CI 17200)
Briefly, what some of these ingredients are:
Glycerin: A type of sugar
Potassium Acesulfame: A calorie free sweetener, also known as Aspartame (gives me headaches)
Carbomer: A thickening agent
Sodium Hydroxide: AKA Lye, corrosive in large amounts, generally used in soaps (I think this may be the stinky factor)
Diazolidinyl Urea: An antimicrobial preservative, some people may be allergic to this, and there's some discussion on whether it is a carcinogen or not
Sodium Benzoate: A preservative typically found in acidic foods
Potassium Sorbate: A preservative typically found in dried and baked goods