HM01 YCS Nano Cleaning Sponge For Mobile Phone Motherboard Cleaning Sponge OCA Sticker Screen Cleaning Clean Cotton. Product: YCS Maintenance Home Nano Cleaning Sponge (HM01). Quantity: Each box contains 500 pre-cut pieces. Features: Made of high-density material, soft yet durable, strong adsorption, and leaves no residue. Uses: Suitable for cleaning mobile phone screens, cameras, motherboards, circuit boards, and removing soldering flux. Safety: Designed to be safe for delicate electronic components and solder joints.