The red soil of the outback is known as bull dust. It’s red, it’s very fine and once it gets into your car, caravan or even a suitcase it’s almost impossible to clean out.
‘Caravanner’ drives the inland road through WA in the brand new van. He complains to the missus that it’s not dust proof like the old one before realising that he left the roof hatch open causing the dust to be sucked in through the vent at the bottom of the door and out through the roof. They’re still getting the dust out a year later.