How do I get rid of P0420 Code for honda accord 2010?

I have had a check engine light for a few days now and when i plugged in a code reader, P0420 came up and i looked up how much it would cost to fix it and it is over a thousand dollars (money i do not have). I looked up a video on youtube by scotty kilmer and he said to put 1 gallon of lacquer thinner in the gas... show more I have had a check engine light for a few days now and when i plugged in a code reader, P0420 came up and i looked up how much it would cost to fix it and it is over a thousand dollars (money i do not have). I looked up a video on youtube by scotty kilmer and he said to put 1 gallon of lacquer thinner in the gas tank when it is half full and drive it at high speeds to clean it. Will this fix my cars problem? I do not want to replace the catalytic converter so what would happen if i ignore the light? Thanks
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