JustStrings.com String Cleaners
This Extra Large Micro-Fiber cloth is exceptionally soft and durable, and has an amazing ability to trap dirt particles and absorb oils. You can clean instruments and strings with little or no polish or liquid cleaner. The fibers are so small that a strand the length of 12 football fields weighs about the same as a U.S. Nickel coin! This allows the fibers to reach into crevices to trap dirt and absorb oils that would be completely missed by traditional cotton or flannel cloths. In fact, the fibers are less than 3% of the diameter of cotton! After extensive use, the cloth can be washed and reused many times.