This is no word of a lie.
I do some offices in Avonmouth - wfp every two months.
They have 4 windows that "look out" onto the warehouse floor which is concrete and has drains. The windows are behind racking which is off the floor and which blocks the windows to make it difficult to squeegee.
But I can get a wfp brush behind like you do on balcony railings. Every 4 months I wfp those windows and I am inside the building.