I've struggled with this one for some time and I don't see any way to do this and it's very frustrating. What I have is a pre-made sci-fi prop with a glass window where it would be equally nice to just have it be a viewscreen. So I go in to change the material properties to put an AVI video on the area that used to be glass. Originally, the material components consisted of Diffuse and Reflection components. Now I only want it to have a Diffuse component. How do I delete the Reflection component? I can change the reflection texture, but I see no way to delete it.