NOVELTY - The assembly has a cleaning surface (106) capable of collection and/or removal of small contaminating particles from a contaminated surface of a contaminated substrate (116). Another cleaning surface (108) is capable of collection and/or removal of small contaminating particles from another contaminated surface of the substrate, where a part of the former cleaning surface has different adhesion properties when compared to adhesion properties of a part of the latter cleaning surface. The cleaning surfaces are differentially microscopically roughened.    USE - Contact cleaning surface roller assembly for use in a surface cleaning apparatus (claimed) for cleaning double-sided, unbalanced contaminated substrates such as double-sided thin polycarbonate films and foils, during manufacturing of electronic components such as plastic electronics, photovoltaics and flat panel displays.    ADVANTAGE - The cleaning surface has a different adhesion force profile when compared to an adhesion force profile of the other cleaning surface so as to increase efficiency of the removal of the contaminating particles. The former or the latter cleaning surface is microscopically roughened so as to enhance collection and/or removal of the small contaminating particles from the contaminated surface by increasing the mechanical adhesive forces of the cleaning surfaces. The cleaning surfaces are differentially electrostatically charged, so that any imbalance in the adhesion properties of the surfaces of a double-sided contaminated substrate to be cleaned due to electrostatic forces can be reverse matched by the difference in electrostatic charge of the former cleaning surface when compared to the electrostatic charge of the latter cleaning surface, thus mitigating problems associated with wrapping or creasing of the substrates during cleaning and processing of the substrates.    DETAILED DESCRIPTION - The cleaning surfaces are made of an elastomer material. INDEPENDENT CLAIMS are also included for the following:    (1) a method for cleaning a double-sided unbalanced substrate contaminated with small particles    (2) a surface cleaning apparatus.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a surface cleaning apparatus.    Surface cleaning apparatus (100)    Rotatably mounted surface cleaning rollers (102, 104)    Cleaning surfaces (106, 108)    Rotatably mounted adhesive rollers (110, 112)    Contaminated substrate (116)