If your vacuum cleaner contains bags you should change them regularly for cleaning it safely and effectively.
If you these types of vacuum off of the dirt too still looks dirty, it may be time to clean it with a cleaning solution and rainwater. http://yorkcrafts.com/__media__/js/netsoltrademark.php?d=Psa7330.pohangsports.or.kr%2Fbbs%2Fboard.php%3Fbo_table%3Dmn3_2%26wr_id%3D351506