Cycles. The object doesn't show the material I want, but other, how do I delete unwanted materials? I modeled Plastic Plate in Blender, then added Clear Glass Material, also render in Cycles, but it doesn't show the glass material. See the result in the image below at the left-hand side. My question continue at the second or Image 2.
Image 1.


Here I render the object in Blender, everything was fine to me. Why it can't work in Cycles, or how to do make it to work?

Image 2.


Then in the image below; how to delete these materials. See Image 3.

Image 3.
just make sure no Object use your material you want to delete . Unset from all objects in your scene .
then go to file&gt;Clean up &gt; purge all
save your project
close and re-open .
Do it times to clear Scene completely .