For those who have everything: Klin-Tec UV-C Stick

Let dirty dishes collect in your dishwasher for any amount of time and you can predict the result: a buildup of bacteria that can unleash an awful smell every time you crack the machine’s door. The new Klin-Tec UV-C Stick blasts away this annoyance by automatically bathing the dishwasher’s insides with germ-killing UV light once every 24 hours. Because the device ends its 12-minute run time instantly if the door of the washer opens, you can just set it in a rack and forget it—at least until you’re ready to run a wash cycle. This gadget is “unfortunately not waterproof.”
$31, proidee.co.uk
Source:Gizmodo.com