I tried it...
I eventually got around to trying ACDO washing powder.
It actually smells quite nice in the box - a soapy, yet relatively understated fragrance.
A small load of laundry and about 40ml of the powder, in the Panasonic NA-168XR1. No other product used, no fabric conditioner. On the Econavi-Autocare programme.
The machine weighed the load and calculated 1hr 18mins to complete. So far, so good.
Water intake and the soap powder flushed away cleanly.
Drum speed increased to distribution speed in order to mix the solution: virtually no foam... (Other detergents do foam up at this stage).
Wash continued, spray jets periodically activated, no foam, but some undissolved particles observed by me, on the door glass.
The machine wash obviously looking too, 'cos...
Wash time reduced normally until about 1hr 07mins, then increased in a flash, to 1hr 37mins! (I nearly had kittens...)
Wash continued, virtually no foam. Particles eventually dissolved quite cleanly.
Drained and spun okay with about 45 minutes to go. That was odd - with other detergents, the rinses kick in at about 35 mins, and do two rinses only.
This time, 3 rinses activated. Intermediate spins between rinses operated fine. No foam.
Final rinse had the faintest sensation of a few tiny soap bubbles on the door glass.
Spin activated smoothly.
When unloading, I saw chalky tide-mark deposits on the upper reaches of the door glass, where the spray jets had trickled/dribbled as they were switched on and off.
Laundry smells clean, and looks clean. No overpowering artificial stench of flowers.
Obviously the machine's 'all seeing eye' detected the cloudiness of the wash water, increased wash time and temperature, and added an extra rinse - all automatically, of course.
Liquid detergents on the other hand, seem, because they're more transparent in solution, to allow the machine to default to a shorter, speedier cycle (the usual 1hr 18mins with only two rinses).
This Panasonic is really NOT liking Ariel Liquid. For some reason, Ariel Liquid is leaving a pungent, sour smell in the machine that is transferred into the laundry. It doesn't matter whether fabric conditioner is used or not, either. I never had the problem with the previous Panasonic machine. I think there is some kind of reaction between Ariel liquid and the rubber compounds in the seals and hoses. Not nice at all. Powders though, seem to wash fine with no pungent smell.