The sterilization of the external surfaces can occur with a suitable means, for example by spraying with a biocidal chemical, with H2 O2, with {TAIL ~ steam} or by flooding with {HEAD ~ ozonated water} 
The sterilization of the external surfaces can occur with a suitable means , for example by spraying with a biocidal chemical , with H2 O2 , with { TAIL ~ steam } or by flooding with { HEAD ~ ozonated water }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD