Sorry for writing in English, but I'm quite far from Poland and my Polish is rubbish.
Product was tested against 2 other, a-brand, acid ph shampoo's. This product might not have the best smell (it also isn't aweful) but works fantastisc. You can notice the polymers providing additional slicness when washing the car, but also waterspots being removed and the coating starts to "open up" after a long time without a wash.
The shampoo does not provide a lot of suds, which is not required, so don't expect to have a thick layer of suds in the car or in the bucket.
Again, fantastic product!