Since no one lese is responding... To make clear glass, set the color to white or as near as white as you dare. When using diffractive materials, this makes your material clear (do not use transparent materials). However, clear glass sucks in a rendering because it is transparent. In order for a clear material to show up, you need to show what it shows in the real world, which is reflections. So add a mirror (0.1-.0.3) and enable a reflective environment so your material has something to reflect. Be sure to set the number of refractions so the light can pass through every surface of your glass material - if it is a box, the refractions need to be set to at least 4 (one for each refractive surface - inside of glass body one, outside of glass body one, inside of glass body two, outside of glass body two)
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