I have to disagree over first clean with WFP isn't the best, thats a lame excuse, if done correctly there is absolutely no reason why a job shouldn't look spot on after first clean with WFP.
to many people hide behind this 3 cleans until they are right nonsense, if you took you car to be valeted and was told that you wouldn't pay for the poor service would you ? well same applies to cleaning windows with WFP.
Ive never said that to a customer and never will, done 3 new cleans yesterday all in bad state and ok it took me twice as long as it usually would I made sure they were gleaming with 2 of the customers telling me how pleased they were.
future cleans will take half the time so putting all the effort into first clean means there is no excuse.