I used it on the back seat of the car where there were stains from old vomit and my puppy's feces at the time. It is easy to use, did not cause any problem to the car upholstery, smells pleasant, but it does require scrubbing with a wet cloth.

Very good quality brush for cleaning car leather and fabrics. It has a convenient handle and is easy to wash. It is quite stiff so it works well on regular leather, but it may not be suitable for nappa/perforated leather.

The Sonax brush is quite good. It cleaned wherever it was needed without any problems. The only time it didn't perform as expected was when I used it with Armor All Carpet & Seat Foam Cleaner, as it didn't remove summer stains such as sweat and saltwater from the seat upholstery. However, I believe that the brush is not to blame, but rather the Sonax cleaner.

Very good brush, used with Autoglym products. Cleaned the interior extremely well without much effort. Just be careful with the pressure on any leather scratches, although I didn't encounter any issues.

Application with Auto Glym Interior Shampoo. Powerful without causing damage (even to the sky).

Update: After the second use, the fibers in the perimeter started to go awry.