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So just a dry soft cloth and spray the stuff on and wipe...even over dirt?
No, at least not for Optimum, which seems to be one of the more popular rinseless products.
You put (ideally distilled) water in a bucket, mix in a capful or two of the ONR product, use one or more mitts and another bucket of water to rinse out. Wipe the AREA of the car down with the mitt and then dry off with one or two MF towels. Continue until the entire car is done. I modify this a little by using a bunch of mitts and I spray the product premixed in a pump up sprayer with water. On a car, I do half the top part of the car, then the other half, followed by the hood, then the trunk lid, then down each side. 20 minutes max, and I think I can cut that in half with some practice.
Pro detailers are using this method because you can do it in direct sunlight. After you wash, run your favorite spray wax on there and if your car already has decent paint, you won't believe how good it looks. However, a car that has caked on dirt still needs to be rinsed off. If that's the case, stop by the self serve car wash on your way home, rinse down thoroughly, go home and have dinner, then do the rinseless wash and wax that evening.
Had you told me 2 months ago I'd be using a rinseless product, I would have rolled my eyes.