Covering utensils with cloth

Hello, everyone! We had another lesson last night. I have been practicing bon-demae these months. When you bring in the utensils into the tea room with bon-demae, you place a tea bowl set and tea container on bon, a tray, and cover the items with silk cloth, called “fukusa”. I don’t know the reason why you cover with cloth, but I guess covering with cloth might mean that the items are all cleaned and prepared? Or avoiding from dust? There should be some decent reason for it. Have a nice day.