This makes good horse sense to meI’m not sure they all wang chunged. I mean the singer told them all too, but who knows if they all complied. Of course if you ask the guy, he’s going to say everyone wang chunged because he doesn’t want to look like a loser.
I am sure he had good reasons to demand the chunging.
Side note: Back when this song was a hit I was working at a top 40 radio station (production assistant, general go-fer). The Wang Chung guys were in for an interview when they were in town for a tour. I walked by them in the hallway on their way out and our music director introduced me to them. They just kept walking and did nothing. No nod. No 'hi'. Nothing.

Along with any stains.I think as long as all the chung gets wanged, who does what and to what degree kind of comes out in the wash.