Tony if you are not carrying much water and are hoping to get by using very little water by setting up wfp using a back pack .
You are going to struggle mate you need to use twice as much water as normal , You might need to use about 75 liters on 25 window house , Mike
Ok thanks mike. You live and learn
200 litres bloody amateur ;Dlike the poster said above about seventy five ltres,maybe less
depending on size of window is there any bays etc how much frame you have to clean
and what condition the frames are in.
at least you spotted the problem and corrected it,next time it will be easier
i use backpacks itend to have the flow higher for tops and a little lower for anything
thats eye level.
will be few months before you see potential problems before they happen,anything
that you arenot sure of then run a squeegee over the ground floor windows to dry
them off at least then if you miss anything you have at least reduced the effect.
i still do it occasionally now with first cleans i just tell the customer im just double
checking my work and i have one or two problem windows on my regular work
that just wont take to wfp...they are all ground floor though