Why Pinoys Make Pagpag Of Their Seats In The Jeep

I always see Pinoys in the jeepney who always slap the chairs with their hands after a person stands up and they want to sit to where the person was. They think the chairs are dusty after a person stands up. They also think that slapping the chair will make the warmness go away. It's a weird thing but it also shows Pinoys are people who like cleanliness. ^_^