I have a maytag jetclean quiet pack dishwasher. The top dishes are not getting clean. The glasses always have sandy residue in them and sometimes orange juice etc at the bottom of the glass isn't removed. I have added jet dry, this doesnt work. I ran the rinse cycle today and opened it up during the cycle and I didn't see the middle pop up spin thing in the middle of the bottom shelf doing anything. It should be spraying during the rinse cycle correct? Thanks for your help

Possible that the pump is not working well to spray and inject with good pressure so that the dishes are spot clean.
You will need to simulate the washer without any dish and checck the performance to understand the fault areas.
The middle section also must spray well another reason your dishes are not clean when kept low.
The entire system has to be taken out and the water flow sections must be cleaned. the pump must work and spray with high pressure or else it must be clogged , the reason for sluggish spray.
So check the inlets, the water lines and the pump.
The rest sems fine.