Got asked to clean a snack van yesterday, its got an aluminium trim around it that has several little lines where it's run and marked the paintwork/signwriting. I said yeah no problem £20 and I'll stop by when they are closed today. Went there and tried Virisol neat and gave it a good scrub on a section but unfortunatly it only seems to "dull" it rather than getting rid of it. What's the best thing to use? TFR? Paint seems quite tough but don't want to damage the signwriting with anything too strong.