Electron transport in high mobility electron systems may under some conditions be described using the hydrodynamic approach. However, at charge neutrality (for example in undoped graphene) charge transport is decoupled from the hydrodynamic flow and is mediated by the intrinsic conductivity of the electron liquid. I will show that in the presence of smooth disorder potential the conductivity of the system exceeds the intrinsic conductivity of the electron liquid. The enhancement arises from the coupling of charge transport to the hydrodynamic flow caused by local deviations from charge neutrality. The hydrodynamic flow in this case is predominantly vortical, in contrast to mostly potential flow away from charge neutrality.