My worst job
since becoming a window cleaner was a sewage treatment plant somewhere just north of the Dartford Tunnel. (There wasn't a bridge then, this was circa 1970
) The roof of the building was flat, and the sewage was pumped up and discharged into channels on the roof, it flowed round and then went down through the building into the treatment sections.
In the middle of the roof were some offices, and the channels ran round the base of the office walls. I had to span a ladder over the channels to get to the office windows, and the s**t on the glass was so thick they looked like brown frosted windows. The only way to get it off was to scrape it. It didn't need wetting, it was constantly wet from the splashes from the channels.
Talk about "wasn't fit to shovel s**t........."