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Don't take this the wrong way, but learn to properly wash the car. You're the one creating the swirls as your wash/dry the car. I'm sure Google will take you far, but in a nutshelf, NEVER wash or dry in a circular motion. Always wash and dry in a linear fashion longitudinally (front to back) along the car. Use shampoo that produces lots of thick suds. If you can, avoid drying with towels/chamois. Either use a warm air drier or a high quality non-spotting water filter.
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