Thanks for all the comments. To answer some questions:
We live in detached houses on a generally quiet road, with a mix of pensioners and young families.
We don't let our kids out in the garden early (generally before 8am) or late making a noise. We are a quietish house, the nature of my youngest disability means she has a very quiet voice and literally can't make much noise.
I have no problems with people being out chatting, I was just very grumpy about the jet wash noise and the chatting made me even more irate!
Washing cars etc is not a problem, it's the jet wash late which is offensively loud. It genuinely is as loud, if not louder, than power tools. He also does it at 7am at weekends, which I don't stress about.
They are generally noisy neighbours - swearing loudly in their gardens (front and back), music, they have 4 cars and 2 vans, jet washing each of their cars weekly. A dog that barks if we're in our garden the same time as them. Bonfires without letting us know, using petrol to fuel. We have never complained about any of these. Loud arguments in the street with their adult kids.
They are the outliers, noise -wise, on our street.
I will take on board the feedback about being unreasonable, and not complain again 😅