I found the answer.
"To start with, enter the 'Simulation' menu and hold your phone/iPod/tablet upright to enter portrait mode. You should see a vertical list of every route installed. Now tap the 'edit' button in the top right corner. You should see the selection buttons appear on the left of each row. Simply select the routes you want to delete, then tap the red delete button in the top right corner (where the edit button was)."