Claying carefully with an aggressive clay bar should be the first step for sure, but if this fails to work, the next step should be polishing, as this will be less risky than wet sanding. On plastic light clusters Menzerna Final Polish II is a good choice for starters, and should be applied using a semi-firm foam pad. You can go more aggressive in terms of polish choice if needs be, and this is preferable to wet sanding. As a last resort, wet sanding could be done, but the thin film thickness of the surface coating on modern lights means that it is a risky option. We've never yet had to wet sand lights, machine polishing has been enough. :icon_thumright: