As others said, typically the required exposure is too long. On top of that, many household items may not be UV safe and will degrade (some plastics), or disco

As others said, typically the required exposure is too long. On top of that, many household items may not be UV safe and will degrade (some plastics), or discolor (plastics, fabrics, etc.). To top it off, you can end up just killing the less UV resistant bacteria, and selecting for the stronger ones. Oops. Proper UV sterilization takes time (minutes, hours). I'd worry that many people will just wave a light and think "its clean". It doesn't work that way.