Let's be honest: a foam cannon is fun, but is it really absolutely crucial for a daily driver? It's not, and it's time consuming. Let me tell you what works just fine:
1) Buy a nice sponge (Detailer's Domain Uber sponge is what I use) and some nice shampoo. I use Duragloss 901, my favorite.
2) Buy two buckets, and a single grit guard.
3) Wash the vehicle carefully, going from top to bottom. I use a separate sponge for the low portions of the vehicle, as that usually gets extra dirty.
4) Rinse the vehicle off using the flooding method, and then dry with a nice microfiber.
If you follow the above steps, you will not ever scratch your paint. I know I haven't in all the years I've been washing cars.
I don't personally use coating on my vehicles, and instead use products like Swissvax waxes or Menzerna Power Lock sealants.
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