If you were using what I think you did it does not make "germs" on your hands glow, it is a glow-in-the-dark lotion and it shows how well someone washes their hands, very cool stuff. If cannot determine how effective a soap is just the effectiveness of the soap user. A stain that would stain microbes on your skin would likely also stain the skin and some of them are hazardous.
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~~Nonpathogenic microbes are our friends~~
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