Find more interesting information here: My New Honda City in White - The Albus Exhaustive Guide: Car Detailing Basics
if it is few spots , I soak with tissue paper for few minutes depends upon the dryness and spray water with barbers shop spray bottle / Colin bottle , clean and wipe using MF cloth. If any stain is noticed, the Amway Silicone Glaze will do wonders!
If it on larger area spray abundant water, soap with wet towels and clean with water and believe me, Amway Silicone Glaze will restore and give the final touch. If your car is more prone for such conditions, periodical claying and polishing will always give an extra protective coat to avoid deeper staining.