Driven by improvements in construction spending, disposable income and new business formation, revenues for contract (non-proprietary) cleaning services in the US are forecast to advance 3.2% annually to $65 billion in 2019, according to a new study by The Freedonia Group, Cleveland, OH.  The nonresidential market accounts for the vast majority of cleaning service revenues, and ongoing expansion in both the amount of nonresidential floor space and the number of businesses will bolster deman...