www.daz3d.com/wet-sweat-rain-for-genesis-2-female-s

This set of specular wetmaps can be applied on top of many existing skins, with a simple double-click.
The subjacent skin has to use either the Base Female or Victoria 6 UV-Set.
Furthermore it should use the UberSurface shader, other shaders work as well but will require adjustments.

flipmode3d.com/fm-wetmaps-info/

The set includes no less than 14 wet styles, from subtle to soaked, applying on top of other skins.
Most of them come with "face free" variations, in total there are 27 materials.
Additional modifier materials allow you to quickly add some tweaks.
A soft and a dense rain prop are also included, with puddles, splashes and morphs to control the direction of the rain.
The specular wetmaps will work with any lighting, but a cold and a warm light preset help you to get started.
They are included as both standard DAZ Studio lighting and for Age of Armour's Advanced Ambient Light.