I can't seem to get some plastic parts looking close to a nice pure white. Are there any techniques or tricks to do this?

I can increase the environment brightness, but then the rest of the model will get overexposed.

Also, sometimes when re-importing a model in Visualize (after making changes in SolidWorks) I will get glitchy jagged overlays of textures. Almost as if there are two parts in the same place. Is there any way to remove this, or avoid it from happening?

Thanks