Review on 🔦 Black Light Pet Urine Detection - SMD LED UV Wand with Lithium Ion Battery - 395nm Ultraviolet Blacklight Flashlight for Stains, Parties, Scorpions, and Authentication – 3W by Liz Lee

So use it in a dark room and clean it everywhere and it will tell you if there is any stain, sticky substance or residue of any kind to clean, and after cleaning it, clean it next Tag again See if your product worked...when you get a product that cleans really well, you won't see the stain anymore. PS: Definitely wear glasses! They help you see things not normally visible to the naked eye and this wand is SO BRIGHT that protecting your eyes is a must.