If you want to completely delete an Auction and everything in it, you can follow these steps to do so:
Step 1: Go to Auction -> Edit Settings for the sale in question.
Step 2: Click on the garbage can icon in the top right.
Step 3: Type the word "DELETE" into the window to confirm that you want to delete the sale and its contents.
Step 4: Your auction has been deleted.
Note: This will delete all pictures, videos, and sale data that is present for this sale.