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Along with the introduction of HID-headlamps and a luminous flux beyond 2000 lm the regulations concerning automatic levelling and headlamp cleaning systems were enacted. This reply regarding the position, HID-headlamps would produce a higher glare-illuminance, was only partly accepted. While levelling systems are well established, headlamp cleaning systems are challenged for economical and ecological reasons. The proposed paper will deal with the different aspects of soiling. Because standard dirt as defined in ECE R-1 is not representative for any dirt from the street, the efficacy of HCS on different kinds of dirt are analyzed. Initially 22 headlamps from H4 to HID have been systematically soiled with standard dirt, then the ECE-points and the luminance distribution have been measured. The maximum increase of the glare illuminances should highlight the moment where cleaning could have its most valuable benefit and what the minimal effects of cleaning should be.