I use a brush on a long stick.

I just reach back there. I have these crazy things on my arm called “elbows”.

I mean, I assume the water running down my body when I shower is good enough? Can’t imagine my back of all places getting so dirty that I need to scrub it.

I have a body wash/soap towel that’s long enough to go around my back.

For a good long while I just contorted, but I have some mobility/flexibility issues after a shoulder injury and got a long handled brush, and they’re so much easier.

Japanese exfoliating wash cloth

The only effective way is to find a spouse or partner who actually cares about you.

(now single) Old fart here.

Otherwise this is my current one (they’re all about 4/10 IMHO): Exfoliating Back Scrubber for… https://www.amazon.co.uk/dp/B0C1YZDFFM or something similar

With my hands and a loofah. I’m double jointed in my shoulders and can easily reach every part of my back

I put liquid soap in the palm of my left hand. Turn one the water and put my right hand under, then let water roll off into my left hand. Turn off the water. Wash hands without wasting water. Turn it on to rinse.

There’s a guy at my office who would let the water run for the entire five minutes that he brushed his teeth after lunch. I got so sick of it that I printed a sign and taped it to the wall. It said not to waste water and to turn it off while brushing. I haven’t seen him doing it since, but I also haven’t seen him at all since. I hope he saw it before someone took it down.

Edit: misread the title.

Water

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As best I can.

The only way anyone should ever do it.

Soap the washcloth, hold opposite corners diagonally for what I can’t reach, occasionally use a brush for extra measure.

I got a prehensile penis.