I can assure you I know what im doing with the pole!!!
Every other window on my round comes up perfect.
Even when these windows are closed tight and on some of them the seals are ok water still leakes into the inside.
So because of this no matter how good you are with the pole NO one could clean these perfectly with wfp
P.S. S.Ball. I have the hang of it now

Trust me. 18 months in total with wfp