We have had our Bosch dishwasher for about 4 years with no problem and it has just started not cleaning properly - getting wet but not clean. We have checked that the arms are moving freely, the water is heating up and that the soap is being released. Our water pressure is good and it is draining ok. We are running out of ideas. If I had to guess I would say the bottom arm is not moving but I cannot see why - it is not snagged. We welcome any suggestions.