Still, you probably could just let the boots dry, then whack them together a few times to get the crud out of the Vibram. But, with a high-end pair of boots like the Cerro Torre's ($375) it's prudent to give them a little more TLC. Here's what to do: Get a scrub brush with moderately soft bristles. Run cool water over the boots, and as you do give them a scrubbing with the brush, paying particular attention to seams or anyplace where dirt and grit might lodge and abrade the stitching. Rinse the insides, toothey can take it, and sweat from your feet is acidic and should be removed a few times a year.
Then, let the boots dry in a warm placebut not in front of a heater or in direct sunlight. Once they're dry, give them a light coating with a leather conditioner such as Nikwax Liquid Conditioner ($7.50), and either a brush-on wateproofer such as Nikwax Aqueous ($7.50) or a spray-on one such as Tectron Shoe Guard ($5.50). Give the boots that sort of treatment a once or twice a year, with a light cleaning when they're muddy in between overhauls, and they should give you many years of good service.