I was very pleased...
On rims that hadn't been cleaned for years (literally) and were black from the brakes, it did a very good job after 2 applications...

The best product for cleaning brake dust on car rims without scrubbing
For heavy dirt, a second application gives a perfect result

Very good product. I put it on the rims and it cleaned them immediately and much better than if I had used a sponge.

It was used on rims that had years of baked-on residue from brakes. I can say that it removed a significant amount for a satisfactory result. Let it work for as long as recommended and it is like a gel, which makes it difficult to dry out. If you want something stronger, you need to go for a very acidic product, but make sure to thoroughly check the instructions.

I was amazed at how good it is. The rim had dirt from the previous owner that apparently was never cleaned. I had even scrubbed them with sandpaper and they wouldn't come off. I did 2 passes with the cleaner, scrubbed them with a hard brush and they became like new. I recommend it, you just need to put in a bit of effort for tough dirt.

I don't know if I didn't apply it correctly, but it leaves a film that dulls the color, especially when washing, and it doesn't come off easily

Can someone please tell me if it works for the rust behind the rims? There on the axle where the rim fits. And if not, can someone suggest one to me? Thank you

TOP...I have tried weak and very strong irons but this one is strong enough, it does not affect the paint-coating of the rim at all during rinsing, it leaves complete hydrophobicity and shine on the caliper and the rim, for me it is TOP..

Powerful wheel cleaner as I expected from Koch Chemie. It doesn't need to be used very often, so the 500 ml bottle can last quite a while.

Excellent wheel cleaner. Better results when you scrub it on the rim with a suitable brush. Even on its own, if left to act, it does an excellent job.

AMAZING!! I have tried cheaper iron removers but despite being a small quantity, I used much less product with excellent results. With a similar, much cheaper alternative, maybe due to the way the bottle is sprayed, I only needed almost half a bottle once. With this, I treated all 4 wheels and you can barely tell that any product has been used from the bottle. The result is incredible. Check out the video below as well. https://youtu.be/c_ZTzkSuznk?si=jwpuseFxfHeFb2OE

One of the best wheel cleaners available. Rural black wheels that hadn't been cleaned for a year were whitened with just one use. HOWEVER, I consider the PRICE to be excessively high. With the same amount of money, I can buy 2-3 bottles of K2 company, the Roton Pro and the Roton regular, respectively, which even contain more product, 500 compared to 700 mL and 1 L, at one-third of the price of Koch Chemie.

Awesome product! You apply it on your rims, wait for 4-5 minutes, it will change color and then you rinse it off and they look brand new. So far, I haven't needed to brush them, although my rims are not very dirty.