I'm using flats.

I'm not really answering your question but I just soak them thoroughly in cold water and again through the machine. Then I wash with a wee bit of Omo on a hot wash, cold rinse. PUL covers I put in with a warm load of mine or his or both our clothes. Jim only uses about 6 or 7 nappies a day at the moment so it's just a Low setting for the water.

I figure the hot wash and sunlight help with hygiene. Oh and when I make his cloth wipes up, I use up all those Johnson & Johnson samples with a tiny drop of tea tree oil, in hot water, then squeeze out and into a lunch box for the day.

Sorry I don't know about MCN's I have a couple, but they take up a lot of space in my flat. I have just got a few hemp multifits for night time when he gets older.