A system for use in treating an interior wall of a pipeline having a geometrically-shaped cross-section, the system comprising: a mechanical assembly, the mechanical assembly having a main body and a contact assembly attachable to the main body, wherein, when the mechanical assembly is provided in the pipeline, at least a portion of the contact assembly is configurable to contact with and apply a force to the interior wall of the pipeline; and a chemical assembly arranged serially in line with and attached to at least a portion of the mechanical assembly, the chemical assembly having: a front section having a cross-sectional portion configurable to resemble the geometrically-shaped cross-section of the pipeline; a rear section having a cross-sectional portion configurable to resemble and face the cross-sectional portion of the front section; a container unit for housing a liquid-based removal medium; and an elongated mid section operable to connect to the front and rear sections, the elongated mid section having one or more release units, wherein one or more of the release units are connected to the container unit; wherein the front and rear sections are arranged in such a way that, when the chemical assembly is provided in the pipeline, the cross-sectional portions of the front and rear sections are operable to cooperate with the interior wall of the pipeline to form a chamber, the chamber operable to receive and substantially house the liquid-based removal medium; and wherein one or more of the release units are configured to access the liquid-based removal medium housed in the container unit and provide at least a portion of the liquid-based removal medium housed in the container unit to the chamber and/or the interior wall of the pipeline via the chamber. a mechanical assembly, the mechanical assembly having a main body and a contact assembly attachable to the main body, wherein, when the mechanical assembly is provided in the pipeline, at least a portion of the contact assembly is configurable to contact with and apply a force to the interior wall of the pipeline; and a chemical assembly arranged serially in line with and attached to at least a portion of the mechanical assembly, the chemical assembly having: a front section having a cross-sectional portion configurable to resemble the geometrically-shaped cross-section of the pipeline; a rear section having a cross-sectional portion configurable to resemble and face the cross-sectional portion of the front section; a container unit for housing a liquid-based removal medium; and an elongated mid section operable to connect to the front and rear sections, the elongated mid section having one or more release units, wherein one or more of the release units are connected to the container unit; a front section having a cross-sectional portion configurable to resemble the geometrically-shaped cross-section of the pipeline; a rear section having a cross-sectional portion configurable to resemble and face the cross-sectional portion of the front section; a container unit for housing a liquid-based removal medium; and an elongated mid section operable to connect to the front and rear sections, the elongated mid section having one or more release units, wherein one or more of the release units are connected to the container unit; wherein the front and rear sections are arranged in such a way that, when the chemical assembly is provided in the pipeline, the cross-sectional portions of the front and rear sections are operable to cooperate with the interior wall of the pipeline to form a chamber, the chamber operable to receive and substantially house the liquid-based removal medium; and wherein one or more of the release units are configured to access the liquid-based removal medium housed in the container unit and provide at least a portion of the liquid-based removal medium housed in the container unit to the chamber and/or the interior wall of the pipeline via the chamber.