I have only just bought Autoglym resin polish for dark colours, because my bike is black and shows every mark (swore i would never buy a black bike ever again but hey ho........its worth it) Its brilliant and i would absolutely recommend it. I also like Simonitz carnuba liquid wax, its mega easy to apply and polish off and leaves a great clear glossy shine. I use WD40 on the plastics and they always look great, applied by a soft rag or microfibre cloth.