Reflective properties of materials

[speedy_thrills]

I have a white car with chrome door handles. The handles often get so hot on sunny days that I have to use a sleeve to open them if the car has been standing outside. However the surrounding area that's pained white, the panel itself, remains relatively cool.

Why then are the sun reflectors we use on the dashboards of cars a shiny finish rather than white? It seems white reflects more light.