Been using Squirt for a couple of seasons and a few tips:
Clean chain with soapy water and let completely dry.
Warm little Squirt bottle in hot water bath to reduce viscosity. Sometimes it is just way too thick doesn't appear to soak in. This is the key!
Apply to top and bottom of links and let sit for a while. This is when you have that post-ride beer.
Then wipe the outside of the chain as clean as possible. Clean, quiet, beautiful, long lasting chain!