If you are still having trouble with this, here is another possible answer.

If the heating element in the bottom of the dishwasher has failed, the water may not be getting hot enough to completely dissolve the Cascade powder. You need at least 140 degree (F) water for that. If you just pop the dishes in and turn on the dishwasher, depending on how far away your hot water heater is, you may be filling the dishwasher with mostly cold water.

A test (and workaround) for this is to load the dishwasher, then before turning it on, run the hot water in the sink until it is as hot as it will get, then turn on the dishwasher.

I think the heater in my Bosch has failed, but using the above technique I still get shiny clean dishes. If I don't "pre-heat" the water, I get a white film, particularly on [real silver] silverware.

tanstaafl.