Thanks for sharing your ideas Tony, but for cleaning even at the gas station you can find the cleaner and you can add it to the reservoir, i Don't know how effective that is but it's pretty common these days.Two things bother me here.
1. I thought the Catalytic converters normally get very hot. Have heard of parked cars setting grass fires.
2. Have never heard of Catalytic converters being cleaned. The only fix is replacement. The contents of the converter can be removed, but then all you have is a pipe, not a converter.