Andoer JOYO ACE-30 String Scrubber Fingerboard Cleaner for Guitar Bass Stringed Instrument Compact and space-saving, easy to carry. User-friendly, designed with cambered handle for convenience. With fabric, keep the strings clean increase their lifespan. Easy to use, simply open it up, slip under the strings then close and slide. Easy to clean and work repeatedly, just need a little soap and water.