I'm a big fan of Optimum No Rinse Wash & Shine.
What I do is goto the coin-op self-serve car wash and do a quick water only high pressure rinse. Then, I take a spray bottle with diluted ONR and clean each car panel with a clean microfibre cloth. Super fast to clean a 2-series this way, I find!
Oh, and ONR is a great product if you need to do a quick spot detailing like mud/bird droppings/tar etc. I even use it as a clay bar lubricant.
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