Wash with soap and water and hit it with the spray of your choice whether it is something like Ceramic boost, CS3, Graphene Detail Spray etc. I do the occasional iron remover a couple times a year.
I did my wiper cowl today. I have a 2010 Scion TC and opted to remove the wiper cowl (took all of 6 mins). This thing was completely ash grey and I apologize for not getting a before picture. I was ready to order one from the parts store because it looked so bad. So I began by washing the cowl at the outside spigot with soap and water and let dry completely. Took it inside to the bathtub and hit with Adams All Purpose Cleaner and Adams Short Wheel Brush. Let it dry completely. Then applied two applications with Adams Tire and Rubber Cleaner and was not seeing any oxidation after the second application. Let it dry. Then applied the Adams Coating Prep and it dried almost instantly. I then applied one coat of the Adams Black Trim Restorer and evened it out. This pic was taken 6 1/2 hours afterwards. It looks brand spanking new. Only 41 more hours and I will re-install the cowl back on the car. Awesome product Dylan and the entire Adams Crew.
