Warning, this little green box contains magic! Indeed, having recently bought a plate induction (new), because I had a pot large mattes totally indelible traces (as if the glass was burned). It was nightmarish limit especially when you consider the price of inductions. I then tried the special products Vitroclen like trying several times, rubbing hard or even leaving for 30 minutes, but the horror was still there. White vinegar was powerless as household alcohol. But after I informed via the Net and reading many highly positive reviews about this little box, so I threw myself and I tested this Pierre d'Argent. And there ... miracle !!!! I thought my plate stained forever returns more beautiful than ever thanks to this product. Its use is childish and the result is simply stunning. Hats off!