I just found a professionally-done video by the Washington Department of Licensing of a nail salon inspection. You can watch the six-minute video here.
The video is geared toward consumers (advising them of what to look for in nail salons, including recommendations to ask to view the pedicure cleaning log and to visually inspect the spa), and includes a quick interview with the salon owner Cuc Tran (who thankfully seems to be on the up-and-up and has her salon ready to pass an inspection). Washington inspector Lloyd Wright offers some insight into what he looks for during inspections.
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