UV sanitizing-there are air handler units for both household and commercial HVAC systems to sterilize the air.Also portable units.And for a while you could gt safety goggle cabinets that had UV lights in them to sanitize the goggles in between uses-the lights went out when the cabinet door was opened.
I think high heat or chlorine has been the approach to sanitizing dishware commercially and high heat in domestic machines. I would think that there would be problems with uniform exposure, the ozone byproduct from UV light and the time involved.
That is a cool idea, Malcolm. The LG referenced in Alexander's link must be a UK model. My LG was a 2008 model and it looked nothing like this one.
Of course, we could all just toss our dishes into a 1959 Lady Kenmore washer, as it had a UV lamp for sanitization. Don't imagine it did much, but man, it made the suds glow brilliantly.