It's quite simple, isn't it ? Buy some expensive gold plated Mothers or whatever, water, big sponge and away you go. Nothing wrong with any of that, including hosing off all those lovely suds and then putting the synthetic chamois (povos like me) to good use. It's the hosing bit I want to talk about.
Right, what's the big deal, you ask ? Someone, many years ago suggested that rather than just hosing the car, the idea is to disconnect the nozzle and just run a very gentle stream all over...