{HEAD ~ A cleaning system} according to the invention is shown to comprise a pair of liquid containers 11 and 12, {TAIL ~ a mixer} 13, and a constant displacement pump 14 for delivering liquid through a conduit 15 to a utilization nozzle or gun not shown 
is shown to comprise
{ HEAD ~ A cleaning system } according to the invention is shown to comprise a pair of liquid containers 11 and 12 , { TAIL ~ a mixer } 13 , and a constant displacement pump 14 for delivering liquid through a conduit 15 to a utilization nozzle or gun not shown
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