Start at the bottom

... and work your way up.

This woman seems rather optimistic about cleaning this door with just the one bucket of soapy water. There was no sign of a ladder, so I have no idea how she intended cleaning right up to the top of the door. Or perhaps that wasn't her intention. I'm not sure this handy instructional video is of any use to her.

All I know is that it was a pretty large door and she was a pretty small woman.