Link to Scotty Kilmer's Video: http://www.youtube.com/watch?v=5icTmYItwiE
After watching Scotty's video I was curious if it would actually work. Since we know from my video on diagnosing catalytic converters that the catalytic converters in my Subaru were bad, I though it was a perfect opportunity to try out this theory. I used about 1 quart of lacquer thinner to about 7 gallons of gas. I drove a total of 200 miles and tested the converters. The testing showed a very slight improvement but nothing that I would call significant. It was worth a try. I can say that I did not notice any issues with drivability during or after the test. It may not have fixed the problem, but it didn't seem to cause any other problems either. I feel the check engine light that came on was just a coincidence and not the result of putting lacquer thinner in the gas tank. Here's some useful links for you.
Diagnosing a P0420: http://www.youtube.com/watch?v=9VZ5K8n5jj0
Discussion about this video: http://www.ericthecarguy.com/kunena/18-The-EricTheCarGuy-Video-Forum/47854-does-lacquer-thinner-clean-catalytic-converters#77372
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Does Lacquer Thinner Clean Catalytic Converters? -Ericthecarguy