not really death kind but nearly. I need to descale a very good babycook as I am going to get my second baby into solids next week. You cannot use descaler that you find in shop because of too much chemical. I could use white wine vinegar but it doesn't do the job as good as the spirit one
You can also buy citric acid powder at most good pharmacies (i.e. not the one that told me recently that "they've" stopped making aspirin). It is quite good for removing limescale (recommended for our steam sterilizer).