Very good product, which exceeded my expectations in terms of debris removal. Have cleaned today my dirty S-Line Alus (dirt from last year). And I must say: Chapeau! Without brush or mechanical effects, the wheels are almost entirely made clean. Here I think of Nigrin products usually not as much, but the test results have convinced me then.
Single and clear drawback is the spray head which is very stiff and sprayed too narrow. Next time I get the refill spray bottle and I take my choice. Because of this, 1 point deduction, otherwise full marks.