An employer allows its employees to drive company work vehicles home at the end of the day, so that they can respond directly to work sites in the morning. The company recently announced that it expects employees to keep the vehicles clean, and to wash the vehicles as necessary -- at home and on their own time. When an employee asked why they were not being paid to wash the vehicles, he was told that he had two choices: Keep the vehicle clean as instructed, or leave the truck at work at the end of the day and drive his own car to and from the workplace for his shifts. The employees are hourly and non-exempt.
Is the employer allowed to make the employees wash the trucks without pay?

