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UV flashlights are often available at auto parts stores. They are used along with UV dye for finding leaks in automotive air conditioning systems. I think I paid about $10 for mine. Price & quality varies. I don't know if this is the sort of thing you are looking for or not.
"UV light exposure causes most hydrocarbon or organic oils to fluoresce. Inspection is carried out by directing a light source of wavelength 0.36 µm to 0.39 µm at the surface from a distance of around 100 mm to 200 mm in total or near darkness. Any evidence of fluorescence indicates unacceptable surface cleanliness."
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