Abstract: An apparatus and a method for cleaning the inner wall of a pipeline, which includes providing a pig component, of the type having a pig body, a plurality of spacers around the pig body, the spacers making contact with an inner surface of the pipeline wall, a forward end of the pig having a plurality of pressure nozzles positioned thereon for allowing fluid under pressure to flow therefrom onto the inner wall of the pipeline; a bore through the pig body extending from an opening in a rear end of the pig, to the forward end of the pig; a valving member on the forward end of the pig for moving to the open position to allow the fluid to flow to the pressure nozzles when sufficient fluid pressure is placed on the valving member; providing a fluid under pressure, such as water or chemicals, to the rear and front of the pig, the fluid forcing the pig to move forward under pressure; encountering an obstruction, such as paraffin, formed along the inner wall of the pipeline fo such amount to hinder the forward movement