You are viewing a single comment's thread from:RE: One of my favorite gadgets: UV FlashlightView the full contextrishi556 (70)in #stemgeekscontest • 5 years ago Isn't this the stuff you can use to find semen or blood in hotel rooms?
Depending on the wavelength, lots of things can light up.
If you shine it on your light switches, you'll very quickly want to go get something to clean them.
Go get one and a large spray bottle of rubbing alcohol and a rag.
Not me.