If the windows are stained, the pros have accurate cleaning solution, like window cleaning soaps and chemicals, to ensure that your windows look brand new.
There's a reason why they're in this business. https://datescloud.com/?_out=aHR0cHM6Ly93d3cua2VucG9ndXkuY29tL3BoYXNpY2tvbWJhdGl2ZXMvcHJvZmlsZS5waHA/aWQ9MjI2NjQ4Ng