Tony Hwang wrote:

Hi,
Is your water hard? What is the point of running DW if plates have to
be pre-rinsed.? For us organic phospate free detereget tablet work
well. Maybe DW should be put thru couple cleaning cycles using
vinegar or CLR.

Phosphate-free detergents do NOT work well. Perhaps they work well enough
for you, but most cannot abide the hazy film left on flatware and glasses.