The VisibleDust Swabs are made from a special non-woven material that can hold liquid well and is soft enough to prevent scratching valuable sensors. Thanks to patented mini-channels in the material, the cleaning fluid is evenly distributed to achieve optimal results. Additionally, streaking is prevented. Please note that the swabs are for single use only. Only one type of cleaning fluid should be used at a time. Methanol or Eclipse cleaners are not suitable. Sensors should be free of dust before wet cleaning, using a VisibleDust Brush or compressed air. A swab should only be used twice on the sensor. Start with one side, then flip it over and clean again with the other side. This helps prevent scratches from any dirt deposits.