Narrator and Gordon in “Unfinished Business”

After witnessing one of the worst kitchen walk-ins he has ever seen, Gordon moves on to an area outside the kitchen that restaurants are judged upon - the bathroom.

One of the best ways to check the hygiene of any restaurant is always through these bathrooms. Turn that [a blue UV light] on, and turn the lights off. Right, this can be quite scary. [he checks out one of the walls] Oh my good God. Green and yellow identifies bodily fluids. Any form of bleach or any form of cleaning will be identified through the colour blue, but the body fluids on here is extraordinary. [he checks the ceiling] Look, as high as the ceiling, oh my God. Even the ceiling's caked in it, OH MY GOD! This is shocking. [a sign reads "Wash your heads"] Wash your hands, yeah. Honestly, I've seen enough. Let's get the fuck out of here.