Here's a list from naturallycurly.com. The water soluble 'cones are less likely to build up:
Amodimethicone..........not soluble in water by itself
Amodimethicone (and) Trideceth-12 (and) Cetrimonium Chloride..........mixture that is soluble in water in the bottle
Behenoxy Dimethicone..........Sparingly soluble in water
Cetearyl methicone..........not soluble in water
Cetyl Dimethicone..........not soluble in water
Cyclomethicone..........not soluble in water
Cyclopentasiloxane..........not soluble in water
Dimethicone..........not soluble in water
Dimethicone Copolyol..........water soluble
Dimethicone copolyol..........water soluble
Dimethiconol..........not soluble in water
Hydrolyzed Wheat Protein Hydroxypropyl Polysiloxane..........water soluble
Stearoxy Dimethicone..........Sparingly soluble in water
Stearyl Dimethicone..........not soluble in water
Trimethylsilylamodimethicone..........not soluble in water
Lauryl methicone copolyol..........water soluble
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