I can't hide a RawImagen in a camera view

Hi all,
This should be a simple one but…
Im trying to hide UI GameObjects for the camera disabling the layer where they are in (using Culling Mask), but the UI Objects don’t disappear. Actually, when the Culling Mask of a camera is set to “Nothing”, the UI Objects are still shown in the Game window.
Right now I´m testing with only one camera.
Thanks for your time,

I’ve read and seen some tutorials and they seem to say that activating and deactivating layers associated to cameras is the why to go, that is, with GUI Texture.