cleaning personnel need only lift it the short distance represented by the lengthwise extents of edges 126 and 128 and slide it laterally in or out of the tracks 118 and 120 as before no excessive physical effort is required for this procedure fig1 and 11 also reveal the presence of a downwardly depending position locator component 130 which is attached to the door 110 this device extends downwardly such that its tip is positioned at a gap 132 within the lower support assembly 12 above an access door 136 component 130 functions to close or otherwise actuate a proximity switch by its adjacency with switch component 133 fig1 located just behind gap 132 door 136 is seen to be hinged at 138 and is latched at latches 140 note the presence of a lower gap 142 beneath door 136 the proximity switch arrangement assures that high pressure nozzles within chamber 22 cannot be activated until door 112 is in a fully enclosing orientation in similar fashion a position locator component 142 is fixed to the lower region of front door 56 as seen in fig5 locator component 142 cooperates with a proximity switch 144 which extends rearwardly from a circuit enclosure 146 attached in turn to the bottom of deck cover 34 deck cover 34.