Batch comprising: a KRANZ wired high-pressure cleaner fitted with a water lance, an appliance on wheels (surface cleaner) with rotating jets, a KARCHER HD 1050B petrol-engine high-pressure cleaner with water lance, a HITACHI wired concrete breaker (power cord cut) installed on a HITACHI rolling stand with three nozzles, a BOSCH GSN 27 VC wired concrete breaker on a rolling stand (equipment not tested).