We study the effect of the surface adsorption of a variety of common laboratory solvents on the conductivity at the interface between LaA1O3 and SrTiO3. This interface possesses a range of intriguing physics, notably a proposed connection between the surface state of the LaA1O3 and the conductivity buried in the SrTiO3. We show that the application of chemicals such as acetone, ethanol, and water can induce a large change (factor of three) in the conductivity. This phenomenon is observed only for polar solvents. These data provide experimental evidence for a general polarization-facilitated electronic transfer mechanism. Show Partial Abstract