A dart assembly for cleaning tubes including at least one annular disk having a first end, a second end, an outer perimeter and at least one longitudinal groove in the outer perimeter extending from the first end to the second end and at least one cutting wheel. The cutting wheel is positioned within the groove such that a portion of the cutting wheel extends into the groove and a portion extends beyond the outer perimeter of the annular disk. The dart assembly may also include at least one scraper disk and the annular disk and the scraper disk may be positioned at opposite ends of a shaft. Also, a method of cleaning a tube where a dart assembly is inserted into the inner diameter of the tube and forced through the tube using pressurized fluid. The dart assembly may have any or all of the features described above.