My Stoves DW60i/2 dishwasher is a few years old now, and has almost completely stopped cleaning stuff in the top basket (bottom seems OK). I have cleaned everything, filters, nozzles etc, used an anti-limescale cleaner, topped right up with salt/finish liquid, made sure it’s not overloaded or badly loaded, checked nothing is obstructing the arms. It’s been a gradual process, and there seems to be a lot of gritty stuff about. Any help/ideas appreciated.