Yeah I can't get enough regular Cayenne in my MC. I have a high tolerance for heat so I end up putting so much cayenne in the drink that it becomes a nasty sludge.
Enter 90,000 H.U. Cayenne: No more sludge and much better results. I have heard there is higher heat unit Cayenne but I haven't found it at my local store.
Also, I recommend doing lemons for a week, then adding limes. It seems to really take the cleansing up a notch!