Try ignore_photons, it can make a big differnce. I don't know if this will help
you, but below is a texture for glass that gives me good results with radiosity.
Perhaps you could modify it for the plastic you want. Use global_settings {
ambient_light 0 } with it though.

        hollow on

        texture
                {
                pigment
                        {
                        colour rgbf <1,1,1,1>
                        }

                finish
                        {
                        diffuse 0.001

                        specular 1
                        roughness 0.001

                        reflection_type 1
                        conserve_energy
                        }
                }

        interior
                {
                ior 1.5

                media
                        {
                        intervals 1
                        samples 5,5
                        confidence 0.999
                        variance 0.001
                        method 3

                        absorption (1-(<0.95,0.96,0.95>*(1/0.96)*0.98))
                        }
                }

        photons
                {
                target
                reflection on
                refraction on
                ignore_photons
                }

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