A shop vacuum does a great job of sucking up loose dirt.
After digging post holes for deck footings, I was having trouble cleaning out all the loose dirt before putting the footing tubes in. It was even harder to clean out loose dirt from inside the footing tubes after backfilling around the outside. I had dug down to the bedrock and wanted a clean surface for the concrete to settle on. I found that a shop vacuum does a great job of sucking up this loose dirt.
— Dayle Hogg, Toronto