PTFE (Teflon) has one of the lowest coefficients of friction against any solid and won't evaporate like other lubricants, but more importantly it's the only known surface to which a gecko can't stick (according to the gecko adhesion study anyway!). So it makes perfectly good sense to use it in that application.... or seems better than the Ludwig grease balls/dabs to me???
Oh so that's how the Geico gecko slides in and out of those commercials so quickly....:p