NOVELTY - The cleaning apparatus has a support strand (12) that is set in modular construction. An upper guide unit (16) is arranged in an upper end portion (14) of support strand. A lower guide unit (20) is arranged in a lower end portion (18) of support strand. The upper and lower guide units are interconnected with a supporting column (22) which includes several rod-shaped support elements (28). Several cleaning elements (26) are held in the support elements.    USE - Apparatus for cleaning inclined surface such as front surface and roof of object e.g. solar or photovoltaic system used in outdoor.    ADVANTAGE - The upper and lower guide units are biased towards each other, thus quick and easy installation of the cleaning apparatus is realized. As the guide units are firmly held on the object, the need of other fasteners is eliminated. As the cleaning element performs dual function of cleaning and driving the object, the need of separate drive unit is eliminated. Hence, the manufacturing cost and the assembly cost of the cleaning apparatus are reduced. The support elements are self-adjusted according to the width of the object to be cleaned, thus resilient connection between guide units and relevant support element is ensured, and the object is cleaned reliably. The adaptability of the cleaning apparatus with respect to the objects of different sizes is improved, thus the cleaning apparatus is used effectively. As the edge region of the object to be cleaned is engaged behind the cleaning apparatus, the object to be cleaned is held securely. Hence, the movement of the vertical supporting column on the surface of the object is prevented reliably prevented.    DESCRIPTION OF DRAWING(S) - The drawing shows a plan view of the cleaning apparatus.    Support strand (12)    Upper end portion of support strand (14)    Upper guide unit (16)    Lower end portion of support strand (18)    Lower guide unit (20)    Supporting column (22)    Cleaning element (26)    Rod-shaped support element (28)