Cleaning MF seems to be an interesting topic on detailing websites. Personally I bung all of them in on a 30 degree wash and then hang them on the line to dry.
There are MF washes out there but I have no experience of them, Chemical Guys do one.
If you buy the wowo MF cloths then these 100% need washing separately unless you don't mind having pink cloths which is what I now have

In terms of technique then I find doing the windows first dampens the cloth enough to start on the paint work and I have a separate one for door shuts and wheels.