Agreed futurebong - the efficiency of the unit goes down dramatically if you don't keep it clean. This was my experience with the Plenty as well, and I think it's a necessary trade-off between how cool the vapor is and how efficient the stream will be over time. The Plenty has a ridged metal spiral, and the Crafty a two-layer plastic baffle, but in any event the end result is the same.
I've been popping the cooling unit apart into its constituent pieces, swabbing each down with a q-tip/pipe cleaner soaked in alcohol to remove the major debris, and then dunking all of the pieces in alcohol. S&B recommends soaking for less than an hour, as Bill mentioned, but in my experience the whole thing is clean after soaking for only a couple of minutes. No damage so far as I can tell, but given how cheap the cooling units are I'm going to experiment and see how easily/lazily I can clean this thing. I definitely want at least one more cooling unit so I can use one while the other dries.