Sewer Pipe Cleaning Methods

Traditionally, sewer pipe cleaning methods are categorized to: water jetting  water flushing. In a research project, we are going to propose new methods for cleaning. The network has RC and PE pipes (250 mm to 1200 mm) and is only used for waste water (the rain water network is separated). The network is currently being washed by water jet with pressure lower than 100 bar and old nozzles. Unfortunately, this process is inefficient. Are there any more efficient alternative methods?