Dishwasher not cleaning. Over the past 2 weeks, my cups have a sand like substance in them. I have

Question

Over the past 2 weeks, my cups have a sand like substance in them. I have hand washed every item before loading and even changed brand of dishwashing detergent. I then took out the screen in the bottom and cleaning it. It is still happening...help!I have frigidaire professional series dishwasher