Redwood stain removal from car body

Felton CA

Description

Hello, does anyone know a good product to remove redwood stains from the body of my car? I talked with a couple local auto stores and they didn't know. The web says to use a oxalic based tannin remover. The products that I have researched don't tell of ingredients. Do any of you mountain residents know of a specific product? All replies are much appreciated! Thanks!