Had a bit of a shock today, I was doing a block of 12 luxury apartments on the seafront.
Quite a few had their usual splashes of seagull muck, I looked out for the affected windows and gave each one a soak prior to washing.
I started on the job scrubbing each pane until the poo had disappeared, gave a good rinse and moved on to the next.
I finished the job at 4 pm, by which time the windows had dried. The sun was shining on the cleaned glass as it sank lower in the sky. the poo had returned, you could still see it on most of the panes.
Ok did them again, as soon as the water hit the glass the marks were invisible again, only to reappear all be it fainter as they dried. I did one pane 5 times before I was satisfied that all traces had gone.
Now on most jobs, I would have already moved on before the glass dried.
I think it's all to easy to delude ourselves about the power of pure water and WFP.
LESSON LEARNED.