One of my cars developed a terrible mildew smell out of the blue. It was so bad I didn’t want to drive it. I removed everything and saturated the seats and carpet with Odor Xit a couple of times. I even squirted it into the vents with no luck. In desperation I bought the ozone generator and let it run inside the sealed car for 20 minutes. Initial results are extremely promising. I took it on a 15 minute drive today and could smell just the barest hint of something. This is a nicely built unit for the price and it seems to really crank out the O3.