I rinse the car with a power wash then snow foam the car and let it sit for 5-10 mins.
Wash with Gyeon Essence and a lambs wool mit and rinse, wheels are done first with separate brushes etc.
I then rinse again with filtered water which means I have zero hard water spots (costs about 80p each time I use it)
The water filter is re-usable as the resin can be changed its also made for people who professionally clean windows so its not overpriced like the ones made for cars.
I washed the car and rinsed in filtered water and let it dry in 23C sun when it was dry there was not a mark on it, amazing for a black car in a hard water area. Its the 23.6 litre size. Have tried smaller ones made for cars but they are too small to filter effectively as the flow of water is too much for the amount of resin in the canister, especially in hard water areas
https://www.daqua.co.uk/divessels.htm
I then have a heated car dryer with a filter that blows the water off the car and dries at the same time, its 3600W 4.2HP. Saves having to use drying towels and the potential they have for scratching, plus it gets the water out of every part of the car that you couldn't get with a towel.
https://www.amazon.co.uk/Gravitis-St.../dp/B07JMCHTY8
I don't advise using a leaf blower as the air that's pushed out can contain debris/dust etc.
I had the car two stage machine polished and ceramic coated so its immaculate.
Being black it shows every mark if not washed properly
Its not how everyone washes cars but its the best way to avoid any swirls/water marks and is very quick.
I sometimes finish off with a coat of Gyeon Cure to maintain the ceramic coat.