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Chemical analysis of the light scattering film (LSF) formed on interior glass surfaces of automobiles has been undertaken to identify the significant contributing species. Much of the LSF was found to be stable organic compounds, emanating from materials in the vehicle interior, and condensing on the glass. Some compounds found were actually produced by chemical reaction on the glass. The qualitative and quantitative nature of this film was extremely variable. Environmental conditions have been found to contribute to composition of these films. To identify, and reduce or eliminate the contributing materials appears to be the best means to control the LSF.