Often on the Mercedes-Benz C-class (W204), after the filling of the non-original liquid in the tank of the omizer, the indicator "low level of the liquid of the washer fluid" continues to burn on the dashboard. In most cases the problem is that the chemical composition of the new liquid does not correspond to the conductivity of the original liquid, so the sensor in the bachet cannot be recognized. To fix the problem, you can either change the "omywake" to the recommended manufacturer, or increase the conductivity of the non-original liquid by adding some salt, soda or lemon acids.