;
(1)
introduce a cleaning programac comprising for coch ba
in service :
(1) sweeping cut the interior at least once every day;
(11)
external wushing once every six days, increasing,to once every 3 days as depot facilities improve; and
(iii) complete scrubbing inside and cut once every month;
(8) provide a chassis cleaning plant en snsure that each chassis
is cleaned at least once in every six month period.