My dishwasher is an absolute nightmare. Glasses come out chalky and gritty every single time without fail. Most of the time everything else comes out with what looks like 'sand' on them! I have cleaned the arms so many times, it has salt, rinse aid etc etc but nothing helps. I have noticed that the arms are constantly getting clogged even though i am rinsing everything before i put it in there, so i don't know what the arms are getting clogged with. Apart from dumping it does anyone know what this horrible white chalk and sand could be, and everything feels gritty as well. Thanks xx