NHBP is a maintenance PITA as you seem to be aware. ONR should work fine provided your car isn't super dirty. There are a ton of excellent car shampoos: Optimum, Ultima, Lusso, Dodo Juice, 1Z einszett, Chemical Guys, Detailer's Pro Series, Duragloss, etc. Swirls and scratches are more likely to be bad technique (not rinsing often enough, too much pressure,... ) or bad/worn out/dirty mitts and towels than which shampoo you are using.
What are you using for a sealant and/or wax?
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