Product review (5 stars): does in fact descale
Used this in a Miele Futura Dimension 5575 dishwasher, following the somewhat vague instructions. The instructions specify a temperature, rather than the name of a cycle, which is useless if one doesn't know the temperature of each cycle. I tried to find the information online, but had no luck. So I used the normal cycle. It says to add it to the wash after the pre-rinse cycle, or about 20 minutes (I don't recall the exact number). But my dishwasher manual says pre-rinse runs "as required" so... I don't know. I opened the door after 20 minutes and dumped it all in.

Dishwasher looked like new afterwards, and a month later is still free of stains.