"Surface debris" refers to the small pieces of waste, trash, or rubbish that can be found on the top layer or outer part of a certain area, such as the ground, water, or any other surface. Full definition
The idea is that you wash your face with an oil - based cleanser first to get rid of surface debris, like makeup and sunscreen. (allure.com)
Before you brush, floss your teeth, which can reduce the risk of gingivitis, an inflammation of the gums.6 Use a toothbrush with soft, rounded bristles to remove surface debris from your teeth and massage your gums. (thenatpath.com)
Dry brushing is the simple process of sweeping a stiff body brush across the skin in order to clear dead skin cells and other surface debris from the pores. (celluliteinvestigation.com)