I had to remove some screws and the tank fuel ring in order to mount the Bags Connection EVO tankbag hardware. I encountered some corrosion to the screws and some surface rust in the basin where the fuel cap mechanism resides. I removed the red assembly and cleaned with a rag but wonder if I should clean with some sort of corrosion preventative. I also wonder if this is normal. Petrol being what it is I assume corrosion could occur where we put gas in, over filling etc, but is there something else that needs attention?