Stretch  the  breathing  tube  to  remove water  from  between  the  corrugations. Closely inspect the tube for perforations,  small  cracks,  or  signs  of wear, especially along the corrugations. Breathing  tubes  may  have  marks  at the    base    of    each    corrugation    that appear to be cracks.  The marks were created during the molding of the tube. If there are cracks in areas other than the     base     of     the     corrugations     or perforations,  cuts,  and  signs  of  wear, replace the breathing tube. To check the breathing tube for leaks, close   one   end   with   a   solid   rubber stopper.    Close  the  other  end  with  a rubber stopper with a 1/8-inch hole in it.      Stretch   the   tube   10-12   inches beyond its normal length and cover the hole in the stopper.  With the hole still covered,  release  the  tension  on  the tube.      The   air   inside   the   tube   will compress  to  about  3  psi.    Submerge the tube in water.  Bubbles will indicate leaks. Allow the facepiece and breathing tube to  air-dry,  remembering  to  stretch  the breathing    tube    to    release    excess water.  Do not attempt to force-dry the parts by placing them near a heater or in  direct  sunlight  because  the  rubber will deteriorate. When  the  facepiece  is  dry,  install  a cover   lens   to   protect   the   lens   from scratches.    The  cover  lens  is  backed with  a  pressure-sensitive  material  for easy installation. The   carrying   case   also   should   be cleaned.  Turn it upside down and tap both the back and lid to loosen debris. The inside of the case then should be sponged off with the Cleaner-Sanitizer II solution. Clean the Harness Assembly A soiled harness is an open invitation for    eventual    deterioration    and    may reduce    the    serviceable    life    of    the equipment. A  mild  soap  or  commercial  cleaning detergent    should    be    used    on    the harness. Wipe   off   all   surface   dirt   with  a sponge  dampened  (not  soaking) with water. Rinse sponge; squeeze dry. Work  up  a  thick  lather  with  mild soap    or    commercial    detergent. Thoroughly wash the harness with the lathered sponge, being careful to use the lather only. Wipe dry with a clean cloth. Let  the  harness  air  dry.    Do  not place  it  near  hot  steam  pipes  or other sources of excessive heat. 6.  Inspection Following the cleaning-sanitizing process, the entire apparatus is reassembled   and   inspected   by   sight and  sound  for  normal  operation.    All connections  on  the  apparatus  should be checked for tightness. 7.  Recordkeeping Following the inspection, the date and initials of the designated person should be   recorded   on   the   MSA   Inspection Tag.    A  more  detailed  record  of  the operations performed can be noted on the  MSA  inspection  and  maintenance log.    See  page  8  of  this  bulletin  for more details. When  the  inspection  data  has  been recorded,  the  breathing  apparatus  is stored in a ready position (Step 3). 5