I can't remember off the top of my head which builds up and which doesn't, but I would advise you to check out naturallycurly for water soluble silicones and cones that can be removed with sulfate-free or even CO washing. They're pretty obsessive about ingredients over there (more so than even this site, if you can believe it) so there's some great information out there.
From what I've read, only certain cones are compatible with a sulfate-free or limited sulfate routine. Good luck!
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