If you have deleted items from your device or at the web version, SelBuk keeps them so you may use later on. Though if you do not need them any more, you should do the following at the web version web.selbuk.com
Database > Products > View Edit
Settings > Delete items > Save
Click on the minus icon to delete one and then click on the Waste Basket icon
If you need to delete all click on the minus icon and then thew waste basket to remove all your deleted items