the invention is a cleaning apparatus for cleaning elongated and cylindrical filters , commonly referred to as pleated bag filters or pleated bag replacements for fabric sock filter bags , that are open on one end and closed on the other end . the filter is being rotated within a hermetically sealed cleaning chamber . air jets are reciprocated along the length of the filter in close proximity to a circumference of the cylindrical filter . the cleaning chamber is provided with a negative air pressure while the interior of the rotating filter is supplied with a positive air pressure . the air jets tend to loosen and remove the dirt from within the pleats of the filter which dirt is carried away by the negative pressure within the cleaning chamber .