If the sulfate free shampoo contains Cocamidopropyl Betaine or Cocobetaine it will remove all silicones. See here: What's the Scoop on Silicones?

Pomtango, according to the link you supplied, your shampoo contains Cocamidopropyl Betaine, along with 3 other cleansing agents. Your conditioner link didn't have an ingredients list, so check your bottle for silicones (end in -cone, -conol, or -xane). If it's silicone free too, then unless you've used a silicone product since starting CG, your hair should be silicone free.
CG since 11/2011
2c /3a F /Mii, low porosity

Winter Products /Routine:
Clarifying: Herbal Essences Tealightfully Clean
Low Poo: Renpure Luxurious Argan Oil
Co-washes: Suave Naturals Tropical Coconut or Daily Clarifying
RO:
Tresemme Expert Selection Perfectly (un)Done, Cure Care, Suave Tropical Coconut or Daily Clarifying
LI (if needed):
Tresemme Perfectly (un)Done, Renpure Brazilian Keratin Straightening (old formula), Cure Care
Stylers: HETT, AIF
PT: IAGirl's as needed