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Sonax is really an occasional use thing IMO. If you do a good enough cleaning you won't really need another sonax cleaning for awhile. It all depends on how often and how much you drive your car. I've only washed my wheels with soap and water for the past year (since sonax application) and I would say with just soap and water I can get them 99% clean. My car is garaged and driven 2-3 times a week so washes are more of a rare occurrence so the brake dust has time to sit on the wheels. All for reference
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