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I've upgraded mine to hydraulics, and the cable routing with them seems less prone to clogging. I had one race this season where the front clogged, at Hog Hill just before Christmas, but that was a mudfest and it was easy to unclog as I ran large sections of the course.
The rear cable goes inside the rear chain stay, then exits 3-4 cms before the brake caliper. I've never had any issues with it clogging there.
The rider I know has said that the mud clings to the front cable as it's directly in the arch of the fork, minimizes clearance quite a bit. Plus the cable outer has nearly been worn away where he has gotten buildup during a race. Not sure about the rear end, but I presume it's a similar story when you get build up on the wheel, it's likely to wear at the outer?
I don't have a TCX, so can't speak for them all. Just his experience with it. Great looking bike though.
As for routing, my PX SLX routes the cable outside of the arch, with guides down the back of the fork. Seems pretty optimal?