It'll likely get the car clean but it will sure scratch the car!
Around my house and in a maintained car interior, I often use microfiber towels because they allow you to clean without any cleaning agents and microfiber is quite amazing by itself. A damp MF will even clean light oil because it has thousands of fibers that are positively charged which attracts dirt and oil, they also mechanically remove the oil since there's so many fibers and so much surface area compared to cotton, and then the fibers hold it inside themselves since they're hollow. So if your car doesn't have a lot of road grim (which is quite oily), tar, etc, I'm sure any MF wash mitt will make the car clean but I would still never use one without soap because you're gonna be torturing the paint by inflicting countless scratches since you don't have soap to lubricate.
But for many Norwex users, they won't notice the scratches or realize that any MF mitt will have the same result so they'll be satisfied. Just the other day my sister came over and said she was gonna wash her car so I went outside to tell her she could use my foam gun and I see her wiping the down the car with old, scratchy cotton towels and no soap! She said that's how she always does it and she was satisfied cause it did look clean though completely dull. I'm not sure if the dull look was the result of it being swirled to high heaven or if the car wasn't actually clean since she wasnt using MF and instead just appeared clean cause the dirt was evenly spread
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