@ bp1000 - Any thoughts on the rotary-type, mains water-powered car washing 'brushes'? I'm just thinking that if fresh water is being used to power the rotating brush head, all the grit will be flushed straight away and not get the chance to do any damage to surrounding paintwork. Ideally, I'd have one which is auto fed car shampoo - even more ideally it would be powered by a cordless supply so you could vary the speed to water ratio - maybe even use it as a buffer too - with suitable attachments... MW
Argh, no! Brushes are bad
Buy a foam lance and some snow foam! (It's great fun if nothing else
)
Basically you spray the whole car, and let it sit for 5-10 minutes (depending how good you get at making the right consistency). You can literally see brown streaks in the foam as it comes off the car, with no mechanical pressure being applied to grind any of that dirt into the paint.
Then rinse off the foam.
If the car was waxed recently you might be able to get away with this, but for the sake of 20 minutes I will generally still use the "two bucket" method wash the car with decent car shampoo (never washing liquid), and a microfibre or lambswool mitt.
Dry the car, using soft drying cloths, a silicone blade, or a leaf blower (yes seriously).
Once a month I'll wax, using a protective wax (e.g. Collinite), with polishes once every other month.
The paint work is still pretty swirl-mark free but not perfect (mine's a black car). I notice it, but everyone else thinks the car is remarkably shiny!
P.S. Only go onto detailing world if you are prepared to waste hours of your life every weekend, and £00s in waxes and "products" it is weirdly addictive.