Agreed with cleaning windows, lights, mirrors and number plates. Only takes a minute, and with the windows the difference is immediately apparent.
With regard to visability, I drive with my dipped headlights on all the time. Silver cars are a bit invisible and the Jazz is only tiny compared to some massive trucks that people use as cars such as the VW Amorak/Panzer MK2
See the attached map, countries in red have compulsory daytime dipped headlights. It is a good habit to get into IMHO.
I think neighbouring industry getting my car dirty would have driven me nuts.