Why does the Le Creuset cleaner say it's for stainless steel?

We bought our first Le Creuset cookware yesterday (~40% off the outlet price, so almost reasonable) and, although it was probably a waste of money, we agreed to add the $26 bottle of cleaner. In reading the directions, it says it's for cleaning cast iron and stainless steel. I assume there's either laziness or poor translation at work, and I'm interpreting the "cast iron" in this context as "enamel." Why would it matter what material is on the inside? Or maybe it's for enamel and also for cast iron? I saw they also make standard iron skillets. But why stainless steel? Why would I want a special cleaner for stainless steel? Do they mean carbon steel? I never wash my blue carbon steel fry pan since I use that every morning, but if they recommend it for cast iron, it would presumably be good for washing my big wok-style de Buyer pan without stripping the seasoning. Since we've already done paid for this cleaner, I want to wring some value out of it.