This kind of thing entirely depends on where you live. For example, there is no way I'd use waterless wash on any of my vehicles. I live on country lanes in the UK and the car is never clean enough before washing to actually use one of these products.
If I lived in a nice dry area that was often just light dust coating then it'd probably be a good option.
Here is an example of how my cars often get. This was probably 4 weeks of driving in the UK late autumn.
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