The Optimum Brand Superior Lens Cleaner for CD, DVD & Blu-ray Players is a microfiber brush cleaning system that is designed to remove dust and dirt that may cause disc skipping or reading problems. When to use? It is important to keep your CD, DVD or Blu-ray player laser lense clean for perfect sound and video quality. It is recommended to use this product for ever 8 hours of play or every 3-4 weeks. It needs to be replaced when the brushes become dirty, worn or damaged. How to use? 1. Insert the disc into your CD, DVD or Blu-ray player. 2. Start the CD, DVD or Blu-ray player by pushing the play button. 3. Listen and follow the instructions.