Chemical Guys InnerClean Interior Quick Detailer Cleaner and Protectant for Dashboards Door Panels Seats Trim and Surfaces Non Greasy Interior Car Cleaning Spray and Interior Detailer Spray 16 oz

I've been using the Chemical Guys Inner Clean spray bottle and a microfiber cloth. The light gray interior gets smudgy all the time, and this takes off everything that I've hit it on so far. From Amazon, but also available at Walmart, I think. I don't know if there's anything special about it, I hear not great things about Chemical Guys generally, but this has worked well for me.