Most of my work is domestic with a few small businesses.
Have seen a crew working business.
One washes the other rinses........I can tell you that those boys were fast.
If I wanted your set up I would have 2 to a van.
That sounds like an excellent way of working, bet its well fast too!!!
One washes, one rinses??
I for one never rinse as a separate operation, in fact I very rarely rinse at all, for me it is all done on the glass as part of the cleaning process.
As for the which is most profitable?
Where possible send your staff out by themselves, by and large it is way more efficient than having two work together.
Of course there will always be occasions when on certain jobs or days a 2 man operation may be better, you just have to be flexible.
Ian