To remove a specific attribute, select the attribute in the Appearance panel, and click the Delete icon . Alternatively, select Remove Item from the panel menu, or drag the attribute to the Delete icon.

To remove all appearance attributes except a single fill and stroke, click the Reduce To Basic Appearance button  in the Appearance panel or choose Reduce To Basic Appearance from the panel menu. Alternatively, drag the target icon for an item in the Layers panel onto the Delete icon  in the Layers panel.

To remove all appearance attributes, including any fill or stroke, click the Clear Appearance button  in the Appearance panel or choose Clear Appearance from the panel menu.