law: Factories Act, 1948 
  11. Cleanliness 
  (1) Every factory shall be kept clean and free from effluvia
  
  arising from any drain, privy or other nuisance, and in particular- 
  (a) accumulation of dirt and refuse shall be
  
  removed daily by sweeping or by any other effective method from the floors and
  
  benches of workrooms and from staircases and passages, and disposed of in a
  
  suitable manner;
  (b) the floor of every workroom shall be cleaned
  
  at least once in every week by washing, using disinfectant, where necessary, or
  
  by some other effective method;
  (c) Where a floor is liable to become wet in
  
  the course of any manufacturing process to such extent as is capable of being
  
  drained, effective means of drainage shall be provided and maintained;
  (d) all inside walls and partitions, all
  
  ceilings or tops of rooms and all walls, sides and tops of passages and
  
  staircases shall- 
  ( i ) where they are 30[painted
  
  otherwise than with washable water-paint] or varnished, be repainted or  revarnished at least once in every period of five years;
   31  [( ia ) Where
  
  they are painted with washable water-paint, be repainted with at least one coat
  
  of such paint at least once in every period of three years and washed at least
  
  once in every period of six months;]
  (ii) where they are painted or varnished or
  
  where they have smooth impervious surfaces, be cleaned at least once in every
  
  period of fourteen months by such method as may be prescribed;
  (iii) in any other case, be kept whitewashed
  
  or colour washed, and the whitewashing or  colour washing shall be carried out at least once in every
  
  period of fourteen months;
   7  [( dd ) all
  
  doors and window frames and other wooden or metallic framework and shutters
  
  shall be kept painted or varnished and the painting or varnishing shall be
  
  carried out at least once in every period of five years;]
  (e) the dates on which the processes required
  
  by clause (d) are carried out shall be entered in the prescribed register.
  (2) If, in view of the nature of the operations carried on 32[in
  
  a factory or class or description of factories or any part of a factory or
  
  class or description of factories], it is not possible for the occupier to
  
  comply with all or any of the provisions of sub-section (1), the State
  
  Government may by order exempt such factory or class or description of
  
  factories 7[or part] from any of the provisions of that sub-section
  
  and specify alternative methods for keeping the factory in a clean state.