Every Saturday
Clean Van - Clean Poles - Leave Brushes in bowl of Pure water. Replace brushes on poles when filling tank on Sunday evening, ready for work Monday morning.
Don't know if this makes any difference to the brush but they still look nice and fresh. Definately recommend cleaning the pole each week, they get full of crap. and obviously a dirty van doesn't say a lot about the business.
Just a routine I've had since week 1

Wayne