While wet I'd prefer denatured alcohol and a paper towel followed by a razor blade and then a wipe of denatured alcohol (acetone works great too, but is bad to inhale and tends to digest plastics). If it is cured on glass, it may be essentially impossible to completely remove silicone haze, but a good new razor blade will remove any surface silicone and denatured alcohol will help remove the residue. For complete removal of cured silicone, nothing short of an industrial silicone digester like Dicone will totally wipe it out.