Just need 2 buckets, snow foam lance (I just got a the basic cheap one from in2detailing).
I also use a trigger gun attachment for my karcher as it's less cumbersome then the original karcher one and easy to clip on the nozzles and snow foam lance
https://www.in2detailing.co.uk/produ...elease-nozzles
Rinse off the foam, shampoo the car, rinse and then dry. That's my usual normal wash.
If I've washed it not long ago and it's just a bit dusty/grubby I'll just snow foam the car and rinse it without any contact washing.