How would you go about cleaning this roof?

I have to agree with rhagfo. Looking at the pole in the last picture, The top 2 wires will be 120v, the bottom the neutral. In order to get a jolt you will have to touch one of the top two(or the two of them) and be grounded before a shock.

37 years, retired electrician.

I pay someone to wash mine due to size, but in your case, I would move it to a safer spot if you are within a arms reach of the wires. Hard to go camping if you get BBQ'd...lol

Sorry I would wash where it is.
Top three wires are most likely power, bottom three Phone and cable all insulated. I would like see the six lines at the pole in the background.

Wood block under the tongue jack, make sure you have 10' free to the three power lines, you should be safe.

Woo bad spot...
Be careful (goes without saying) my friend!

I guess I'll just have to make arrangements to spot it somewhere to wash the roof a few times of year (what a pain). I never planned on standing up there with a metal brush in hand...would be crawling around with bucket and sponge. Meanwhile, I guess I'll just get what I can from a ladder. By crawling, I should be outside ten feet from the upper wires, but I guess it's better just to err on the side of caution.

Hook it up and move it out from under the wires. You have to be a least 10' from the wires. Not worth letting your aluminum wash brush hit the wires.

I guess it depends on what voltages are up there. 12,000 volts is the "Normal" distribution voltage into housing tracts, so it can ark a long ways - say 12" in a rainstorm.

If the lowest line is only a telephone line, or cable TV, you are pretty safe with that one. But if it is 120 volts to ground from a large transformer, it might not be to safe to touch with a wet bare wash pole brush. And it matters if the high voltage is more than 6' away from where you might be standing.

Safe thing is find another location.

Fred.

Go with the obvious first. No matter how careful you are, To easy to make a mistake and end your life