Well UV is only for flat surfaces any shadow even a microscopic dent that shades light will cancel it's effects. So only for tools or surfaces. in which case many liquids could do better cleaning a surface.
Now they do have practical application in your airflow they have inline uv sterilizers. how ever these are not what you find on EBAY for 50$. True inline uv is just like a weed grow light 600+watts and the bulbs cost alot.
-------------------- Had I the heavens' embroidered cloths, Enwrought with golden and silver light, The blue and the dim and the dark cloths Of night and light and the half light, I would spread the cloths under your feet: But I, being poor, have only my dreams; I have spread my dreams under your feet; Tread softly because you tread on my dreams.
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