Layers Remove Item Commands
You can use 
and then click Remove Item or Remove All Items in the Layer Tree to remove a selected item or items from all layers, from all 3-D layers, or from all drawing layers. When you use these commands to remove items from a layer, the CONFIRMATION dialog box prompts you to confirm before the system removes the selected item or items.
and then click Remove Item or Remove All Items in the Layer Tree to remove a selected item or items from all layers, from all 3-D layers, or from all drawing layers. When you use these commands to remove items from a layer, the CONFIRMATION dialog box prompts you to confirm before the system removes the selected item or items.