Does laque thinner work to clean the catalytic.

Never heard of anyone trying that, and I can't imagine anything good happening. Lacquer thinner is highly flammable, and the last thing you want is additional raw fuel burning in the converter. That is the main way they fail. The catalyst overheats and melts into a glob that restricts air flow. Besides the restricted exhaust, there's much less surface area for the exhaust gas to make contact with so the converter's efficiency goes way down.