Every record, even if thought to be cleaned, is soiled with a wide range of dirt and contaminants, including mold and mildew. Vinyl discs are also coated with sticky mould-release compounds. Contaminants between the groove and diamond stylus or steel needle cause mis-tracking and are abrasive. This results in unnecessary, excessive wearing of both record and stylus. By interfering with proper groove tracking, dirty records produce inaccurate representation of sound. The Disc Doctor system provides a series of brushes and a pint of the cleaner sufficient for cleaning between 300 and 350 LPs. If you want to get the best performance from your old vinyl while your recording it to CD, this is an excellent choice.