As I post this, a load of MFs is doing the final rinse cycle in my Duet HE washer.
All in all, I generally prefer my other, old agitator-style, washer for washing *anything* that's really dirty, and that includes MFs. You know how they say the HE is *sooo* gentle on your clothes? Well, often it's pretty gentle on the *dirt* too

so I do sometimes have issues with the HE washer getting really soiled stuff clean, but generally it does OK with the MFs if I go about it right.
While Dawn works pretty well in a conventional washer, I'm not all *THAT* happy with how it works in the HE one. Talk about sudsing

and yeah, gotta rinse rinse rinse and rinse some more. But then I often do all those extra rinses with my HE washer anyhow (and I suspect my soft water has a lot to do with needing that).
With all the sudsing from Dawn, I generally use a "MF detergent" (currently using up all the stuff I bought from
Bob Danase). I prefer to use the "Sanitary" (super-hot) cycle with a pre-wash and an extra rinse. I often put the detergent right on any really soiled spots on the MFs rather than in the machine's dispenser, but if I do put detergent in there I add it to the "prewash" dispenser, not the "regular wash" one. Then I'll often do a warm wash, *with no detergent* + warm rinse X 2 (on my washer I have to use the "whitest whites" cycle to get that combo) as a "super rinse". It works well for me, but if I notice any sudsing during that final rinse, I'll rinse some more. Yeah...sometimes it gets downright ridiculous how many times I have to rinse, at least if I overdo the detergent (but if I underdo it things don't get clean). But the MF detergent seems to rinse away better than my conventional detergents, and often cleans the "detailing stuff" off better too; for some reason I *really* notice a diff between MF detergent and my regular stuff, but others say they don't so I guess YMMV.