A lot of us are seeing ads for UV sanitizers, but do they really work? What if you could disinfect something at home and within minutes; that’s what an ultraviolet lightbox is supposed to do.

It claims to kill 99% of bacteria, so we’re putting it to the test with the filth finder. The 12 News Filth Finder works by counting the amount of living things on a surface.

Under 30 means it's pretty clean. A score of 30 means it's dirty and can make you sick -- everything from the cold and flu to stomach problems.

We picked this sanitizer up for about $30, and it uses UV lamps to damage DNA in bacteria and viruses.