Hello Barbra. Not likely a drain problem because the machine is evacuating of the water from the sump. The bottom rack i assume is ok.
So the top rack in not doing it's job.
1.......clean out all of the timy holes in the spray arm.
2.......make sure there is nothing stppind the top arm from turning
give it a flick to see if it spins around freely
3..... tall object in the bottom can stop the arm from turning.
4.......some bosch machines have a divertor valve to alternate the water from the top to bottom racks. The valve. if faulty can be stuck in the bottom position not allowing the top arm to turn. Yopu can check this by turnint both arms to line up with easch other, say both arm ends pointing to you . then close the door and start the machine. after a short while of hearing the water swishing, open the door and see if the arms ahve moved. if both arms are turning then you know the divertor valve is ok. Even if your model does not ahve a divertor valve this is a good way of testing the spray arm operation.
Always use good quality soap and avoid tablets. use powder and make sure you have rinse aid in the dispenser.
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