Dimethicone is definitely not water soluble, and is one of the worst cones in terms of tendency to build up. If there is a PEG or PPG in front of it, then it's water soluble (like PEG-12 Dimethicone, for example, or PPG-18 Dimethicone). No PEG or PPG? You'll need at least a low poo to remove it. Cocamidopropyl Betaine removes any and all silicones, so your hair will be cone free after a wash with the Jessicurl.
CG since 11/2011
2c /3a F /Mii, low porosity

Summer Products /Routine:
Clarifying: ACV rinses, Suave Professional Men Deep Clean Peppermint
Low Poo: Renpure Luxurious Argan Oil
Co-washes: VO5 Kiwi Lime Squeeze or Strawberries & Cream
RO: VO5 KLS or S&C, Cure Care
LI (if needed): VO5 S&C, VO5 SC, Cure Care
Stylers: FSG, AIF,
Tresemme Flawless Curls Bouncy Curls gel
PT: IAGirl's (link) as needed