Our fiber rags contain sea island fiber. It's great for removing debris from mirrors and Windows, absorbing moisture and eliminating those lingering streaks, and the microfiber cloth weaves tightly without dropping threads. Its use method is very simple: 1. Wipe the glass clean with water, and then wipe it clean again. 2. To clean greasy Windows, you can first use a rag dipped in soapy water to clean, then wet the product with water, wring it out and wipe it. Use this product on any smooth, non-porous surface, such as glass, Windows, mirrors, car windshields, and even stainless steel.