Top menu >> Setup

Click API.

Click List of view IDs

Select page or process you would like to trash views for.

Right-click and Open in new tab for the one(s) you want to trash. 

Doing it this way you keep the list of views open in your tab and you can trash the view in the new tab you opened, when done trashing the view you can close that tab and continue working down your list. 

Click Edit view

Trash the view.

You can now close the tab you are working on and repeat the steps above for the other views you want to trash.