One thing that might be slowing your guys down is the order they are doing the work. I spotted my guy doing this:
Clean one side of top decoration, then clean the glass on the top in front of it (i.e. doesn't move, just cleans glass below where he's done the top.)
Walks round to the other side, clean other side of top decoration, then cleans the glass in front of it, same as above.
Walks round to side one, realises it's covered in all the mess from doing the top on the other side and has to clean the glass again.
When questioned, he didn't seem to find anythig strange about it.
As for chemicals, I use Fairy - spread it about and leave it five mins and it's a doozy. You don't have to worry about not letting it dry out either, as with TFR.
Vin