I've probably watched a thousand crime dramas where the super slick crime scene investigator whips out a shiny Stain Detector Light and the show's ick factor skyrockets. Of course, I've also considered how great it would be to scan hotel rooms with a stain light before putting my head on the pillow, but figured such gadgets were out of my price range. Not so!
The mini Stain Detector Light from Miles Kimball is just $6.99, and its ultraviolet light will reveal hidden stains instantly so you can eliminate them, and then sit around wondering where (and who) they came from. The Stain Detector Light features a flashlight function, on/off switch; includes stain removal guide. Runs on four AAA batteries.