Oh yes, and dishwasher cleaner. How, in the name of all that's holy, does the detergent know which is stainless steel liner and which is stainless steel cutlery. It doesn't, so why does the cutlery come out clean and yet the liner need a dishwasher cleaner? They've both had very hot and aggressive detergent on them to remove grease and other food particles. The inside of the dishwasher cannot be dirty! The filters, now, are another thing altogether...
And then there's Calgon. We had a washing machine in the Chilterns where the water is so hard you can nearly bang nails in with it, from 1977 'til about 1995 and it had needed some new parts but none to do with limescale. When I changed the drum due to a broken weld it was as shiny as the day it was made! Blood con merchants, the lot of 'em...