You can also try Circa 1850 furniture paint stripper and a razor blade uncover markings. Circa 1850 is usually not strong enough to lift more than one layer of paint per application, but apply it to a small areas and remove it as soon as it starts to lift the paint. The amount of time required to lift each layer will depend on the type and thickness of paint on the vehicle, but it usually only takes a few seconds.
I apply the stripper with a 1" brush so I don't get more on the panel that I can get off in a second or so. I use the razor to lift off the soupy mess and steel wool or a damp rag to clean the area down. After the stripper is removed the remaining layer of paint is usually softer than the untreated areas. A razor works really well to follow markings that you start to uncover in, or under, the softened layer, but I suggest knocking the square corners off the blade edge so they don't dig into the panel.
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