vacuuming carpets, curtains and upholstered furniture cleaning, dusting and polishing furniture, fixtures and fittings removing rubbish and recyclable material, and emptying containers, bins and trays stripping wax from floors, re-waxing and polishing floors cleaning and disinfecting laundry and bathroom fixtures, replenishing supplies and reporting defective plumbing fixtures operating industrial vacuum cleaners to clean floors, work areas and machines removing dust and dirt from ceilings, walls, overhead pipes and fixtures applying acids and solvents to surfaces to remove stains and dirt removing lint, dust, soot, oil, grease, sludge and other residues from machines, hulls and holds of ships, and interiors and exteriors of furnaces, boilers and tanks may clean exteriors of buildings by sand-blasting and applying solvents