This microfiber knobby mitt car duster is safe to use on all surfaces around the home, car, RV, motorcycle, aircraft, or boat. This product is ideal for dusting, but can also be used for washing. It is great for both interior and exterior use. In addition, this microfiber duster is especially adept at cleaning without the use of chemicals. Use them dry, and they will work like magic without scratching, linting, or streaking. Use them damp and they will collect heavier particles. Microfiber works by attracting dust and other contaminants like a magnet and trapping them within its very fine microscopic filaments. This microfiber will not scratch any surface but it can pickup particles that will scratch, please make sure to rinse frequently. The fibers are so tiny they are able to remove 99% of bacteria effortlessly. Due to its superior quality, this microfiber duster can be washed and reused hundreds of times. Care instructions: Machine wash. Tumble dry low, and do not iron. Do not use fabric softener as this would clog the microfibers and reduce performance. Do not use chlorine bleach. Wash with other non linting materials to maintain proper dirt-gripping properties. This set contains 2 dusters, a large duster (23 inches) with a foldable handle for the exterior and a more compact interior duster (14 inches).