To remove all unsold listings from My eBay please follow these steps:
Step 1: Login to My eBay.
Step 2: Navigate to the 'Activity' tab
Step 3: Click on 'Unsold' in the left hand navigation under Selling Manager Pro
Step 4: Tick the 'Select all' box.
Step 5: In actions, select 'delete'
Continue steps 4 and 5 until all unsold are deleted.