I admire folks who do this work as I do not have the patience to clean it all day, I'd rather be driving it!
I used to clean my cars heavily many many years ago when I did car shows, but then my back was in much better condition back then. Some of my previous were entered into concours events, I was on my way to the All Vauxhall Rally at Billing one year in the late 80's only to break down with a blown hose on the M25. I was late for the show and missed the judging, I still lined up with the other club stands cars and was told if I had been on time I would probably would have won it. Ho hum!
I know my zed needs this treatment as it has a few marks on it from when it was sorn'd