person in a navy blue blazer and light blue shirt cleaning a gray security tray with a white tissue

person in a navy blue blazer and light blue shirt cleaning a gray security tray with a white tissue. The person first places a bottle of blue liquid in the tray and then uses the tissue to wipe up black residue from the tray's surface. The scene appears to be at an airport security checkpoint, given the presence of the security tray and the person's uniform. In the background, there's a plastic bag containing items, including a roll of toilet paper. The tray itself has a barcode sticker on it.