reinforcement parts 9 12 somewhat longer than the profile element 13 as illustrated in fig1 offer the advantage of permitting facilitated removal when required in this case the ends of the reinforcement parts 9 12 protruding from the profile element 13 are concealed by end caps these end caps 7 as evident from fig2 are applied to the side ends or in the vicinity thereof on the profile element 13 whereby use can be made for example of tongue and groove connections or snap action fasteners as evident from fig2 it is possible to configure the end caps as regards their outer definition lengthwise in accordance with the task involved for example it is thus good practice to shape the end caps 7 so that they render the profile element 13 trapezoidal as viewed from above this is of advantage in cleaning corners and edges difficult to access as evident from fig1 and 2 it is furthermore possible to employ a reinforcement part 12 inserted into a corresponding cavity in the vicinity of the trailing edge as the spindle for a universal joint 14 in attaching a handle to the frame for this purpose the profile element 13 comprises to advantage a recess 11 in the rear portion in the middle of the profile element 13 longitudinally which interrupts the recess into which the reinforcement element 12 serving as the spindle and of round cross section is inserted a corresponding appendage on the handle forms together with this spindle a universal joint about which the frame can be pivoted so that each of the face surface areas can be used as the wipe surface area in addition providing a universal joint in the rear.