37 Janitorial services; cleaning, and maintenance [ and/or repair ] of floors, carpets, construction building materials, ceramic, point of sale displays, shelving, fixtures, ceilings, industrial and commercial appliances, sidewalks, restrooms, toilets, sinks, urinals, piping, electrical systems, furnaces, refrigeration, HVAC, glass used in displays, building windows, buildings, doors, locks, restaurants, cafeterias, cafes, grocery stores, butcher shops and machinery, ceramic tile and ceramic used in commercial and public establishments; [ waste disposal for others, septic tank cleaning; ] cleaning of buildings, floors, ceilings, appliances; [ plumbing services, plate glass installation and repair services; ] and acting as an outsource service provider in the foregoing fields