The Cyclone Dirt Trap bucket insert sits at the bottom of your bucket while you wash filtering water non-stop. It's the filter that never stops. The cyclone Dirt Trap help eliminates wash swirls and scratches with Cyclone Dirt-Trap Filtration Technology. The round wash screen separates abrasive dirt and silt from clean and soapy wash water with scores of cyclonic dirt funnels. Separating dirt from clean and soapy water keeps abrasive debris off the wash mitt, and therefore off the paintwork for a scratch-less car wash.