This subclass covers only cleaning, which is usually classified according to one (or more) of the aspects mentioned below, if it is not fully classifiable in a subclass providing for any of the following aspects:

the articles cleaned, e.g. bed-pans, urinal or other sanitary devices for bed-ridden persons A 61 G 9/02, filters, semi-permeable membranes B 01 D, castings and moulds B 22 D 29/00, vehicles B 60 S, coke ovens C 10 B 43/00, building forms E 04 G, boilers F 22, combustion apparatus F 23, furnaces F 27;

the general nature of the cleaning, e.g. preparing for sugar manufacture A 23 N, domestic cleaning A 47 L, treatment of textiles D 06, laundry D 06 F, air-conditioning F 24 F;

the particular operation performed, e.g. filtering B 01 D, separating of solids B 03, B 07, sand-blasting B 24 C;

the particular apparatus or device, e.g. brushes A 46 B, mops A 47 L, centrifuges B 04, hand tools B 25;

the substance cleaned, e.g. metals B 21 C, C 23, water C 02, glass C 03 B, leather C 14 B, textile fibres D 01;

the substance removed (or prevented from depositing or forming), e.g. implements or apparatus for removing dry paint from surfaces B 44 D 3/16, chemical paint-removers C 09 D 9/00, preventing rust C 23 F;

the substance used, e.g. macromolecular compounds or compositions C 08, anti-icing materials C 09 K, detergents C 11 D;

the operation in connection with which cleaning is done, e.g. metal rolling B 21 B, metal boring B 23 B, soldering B 23 K, textile fabrication D 01 G, D 01 H, D 03 J, D 04 B;

the surroundings of a surface to be cleaned or kept clean, e.g. water in a boiler C 02 F, air in a room F 24 F.

Processes using enzymes or micro-organisms in order to:

liberate, separate or purify a pre-existing compound or composition, or to

treat textiles or clean solid surfaces of materials