Is there a better way?

[Infinity]

@Bunkerboot83

I would use water balloons filled with GG4, dawn or other favorite solution followed up by a couple of purified to rinse. But what do I know - I’m new.

This made me laugh! I almost choked on my lunch :). I would suggest SuperSoakers for the rinse ;).

[karlosdaze]

I would have 1 short handled wfp with adjustable head, 2 guys, 2 backpacks & 2 ladders.
Place the ladder between the middle of 4 windows (or 3 if you feel more comfortable). The other guy can set up the next ladder on the ground with adjustable feet & turn the backpack on & off as needed. The guy on the ladder does all the wfp work & up/down ladders. The guy on the bottom does all the ladder set-up & backpack on/off.