The invention is directed to a composition for simultaneously washing and waxing an automotive exterior surface. More particularly, this invention relates to a wash and wax composition that imparts a detergent-resistant wax to the vehicle surface. The composition comprises water, nano-scale particles of a wax, a surfactant, n-octyltriethoxysilane, diethoxyoctylsilyl trimethylsilyl ester of silicic acid, and an amino-functional siloxane or tetra(trimethylsiloxy) silane, wherein the wax particles, n-octyltriethoxysilane, diethoxyoctylsilyl trimethylsilyl ester of silicic acid, and amino-functional siloxane or tetra(trimethylsiloxy) silane form an emulsion or dispersion in the water.