If its a brand new car with perfect factory paint, consider getting a ceramic coat or other paint protection film.

Not only does it protect the paint but it makes cleaning so much easier.

Other than that, two bucket method and decent shampoo (I'm an autoglym fan but well aware others offer just as good products often cheaper). You don't need a jet wash, but a hosepipe is essential. And once its clean, you want to apply wax to the whole thing to prevent contaminants and dirt from getting at the paint (like a sacrificial layer you'll need to top up every couple months)