Here in Oregon vacation rental management companies that pay cleaners as independent contractors are being targeted by the state's Employment Division with audits. Often their audit results in a finding that the cleaners are Employees, not Contractors.
Here is what the IRS says about the topic:
“The general rule is that an individual is an independent contractor if the payer has the right to control or direct only the result of the work and not what will be done and how it will be done. The earnings of a person who is working as an independent contractor are subject to Self-Employment Tax.”
In the past I have dealt with this issue by having independent contractors sign an agreement that says:
This is a useful document describing how the IRS defines employees vs contractors.