One and all I ask for your assistance and experience. I have an 06 Yamaha FZ1N with the four into one header pipe assembly common on all Fazers. When I purchased the bike I was concerned about some staining and road crud on the headers but was confident that I could remove it. After trying the hot soapy water and elbow grease remedy I can now confirm that I was wrong. Does anyone know of a method or product that can help me remove the old grime without scratching / steel wooling the pipes?