I suppose given the heat levels it’s normally exposed to, could also just leave a heat gun pointed into it at full tilt for a bit lolCleaned out the catalytic converter on my M1151A1. Turned it intake end down in a 5 gallon bucket to catch the mess. LOTS of BB-sized carbon granules fell out before even starting the process. Used a very concentrated solution of Simple Green followed by a 5 gal bucket of scalding hot water. After donning safety glasses, I then sprayed an entire can of carb cleaner followed by a high pressure water hose rinse. I used a leaf blower to dry with very little restriction in flow noticed at the output. Using the AL sunshine to finish drying up any residual moisture.
Before
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After
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Curious how well this’ll work for ya, might give it a try on mine. For now I just robbed a cat from another truck, so the clogged one is sitting on a shelf.