  We consider single charged Higgs ($H^{\pm}$) production in association with a
$W^{\pm}$ boson at $\mu^+\mu^-$ colliders, in the context of the general CP
violating Two Higgs Doublet Model (2HDM). We find that large cross-sections for
the processes $\mu^+\mu^-\to H^+W^-,H^-W^+$ are possible, and offer an
attractive way of producing $H^{\pm}$ at $\mu^+\mu^-$ colliders. The difference
in the cross-sections for $H^+W^-$ and $H^-W^+$ may exceed 1000 fb, and this
represents a novel way of probing CP violation in the Higgs sector.
