I work at a used car shop where we detail about 8 cars a week. We've been using these brushes for a few weeks now, no complaints. The brushes were mainly used to clean car carpets. You should do this at the beginning of the cleaning process, as it will spread some dirt throughout the interior of the car. Our process is to (1) wet/soap everything with an extruder, then (2) hit it with those brushes on a cordless drill, and (3) vacuum it all up with an extruder and vacuum. These brushes are a little softer than the ones we've tried, but hold up well.
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