  UV radiation from white dwarfs can efficiently clear Galactic globular
clusters (GCs) of their intra-cluster medium (ICM). This solves the problem of
the missing ICM in clusters, which is otherwise expected to build up to easily
observable quantities. To show this, we recreate the ionizing flux in 47 Tuc,
following randomly generated stars through their AGB, post-AGB and white dwarf
evolution. Each white dwarf can ionize all the material injected into the
cluster by stellar winds for ~3 Myr of its evolution: ~40 such white dwarfs
exist at any point. Every GC's ICM should be ionized. The neutral cloud in M15
should be caused by a temporary overdensity. A pressure-supported ICM will
expand over the cluster's tidal radius, where it will be truncated, allowing
Jeans escape. The modelled Jeans mass-loss rate approximates the total stellar
mass-loss rate, allowing efficient clearing of ICM. Any cluster's ICM mass
should equal the mass injected by its stars over the sound-travel time between
the cluster core and tidal radius. We predict ~11.3 solar masses of ICM within
47 Tuc, cleared over ~4 Myr, compared to a dynamical timescale of 4.3 Myr. We
present a new mass hierarchy, discussing the transition between globular
clusters dwarf galaxies.
