Even in the age of smart homes and high-tech office buildings, cleaning remains a stable, if somewhat traditional, industry.
Before autoscrubbers, floors in airports, train stations and other large facilities were dust mopped and then cleaned using mops and buckets
The processes and equipment exist today that allow a person to clean at 10,000 square feet per hour or more and do an excellent job.
Less than 2013.
More than 2013.