A tray assembly able to be quickly installed and removed from the handle struts of a wheeled luggage bag by a mounting engaging the struts and a tray included in the tray assembly flipped down from the mounting to provide a horizontal support for various articles such as small electronic devices such as laptops, tablets, at a selected level above the top of the luggage bag. The cleaning device includes a cap having an opening to an inner cavity, the opening being adapted to receive a site of the medical implement. or below to form a silicon oxide film of 4 to 20 nm thick on the surface of polycrystalline silicon. The electronics module can be easily removed for garment maintenance.