37 Industrial cleaning services, namely, pressure washing services, hydro-blasting in the nature of pressure cleaning of surfaces, wet and dry vacuum cleaning, hydro excavation services, vacuum excavation services, and cleaning of industrial surfaces and equipment to remove slag; cleaning of external surfaces of buildings and structures; cleaning of boilers, fireboxes, economizers, tanks, industrial storage vessels, evaporators, industrial columns, tanks, pits, refractories, condensers, air preheaters, exchangers, ducts, silos, bins, precipitators, and cooling tower basins; non-hazardous waste clean-up services; waste cleaning services; industrial cleaning consultation services, namely, consultation services in the field of cleaning industrial premises, machinery, and equipment