As some of you know I recently bought a 220v DeLonghi Magnifica ESAM4200.S. I am liking it okay so far and I am getting nice twice daily cappuccinos from it. Today the descale light came on and I pulled out the manual and the complimentary package of rescaling solution. The stuff doesn't list the ingredients. Now that's bad. No MSDS no ingredients no nothing. The instructions say never use acetic solutions which I take to mean vinegar but to only use their stuff. Sounds like bs to me. I have always used vinegar for rescaling just about anything with calcium deposits. They say I would void the warranty. Hmmmm are they just desperate to sell me this crap? What is it? I am handling an unknown chemical in my espresso machine. That sucks. So anybody want to weigh in with facts and/or advice and/or opinions?