Under the lap, into the wall
Vinyl siding laps downwards for a reason. A wand aimed upward at 2,000 psi pushes water up under the lap and into the sheathing, where it does nothing visible for two years and then does something expensive.
Chalky siding is a different job
Older vinyl and painted surfaces oxidize into a chalky film. Washing it makes it look better wet and streaky dry. It needs a different chemistry and, sometimes, the honest answer that it needs painting rather than washing.
Windows, screens and light fittings
Screens come off or get covered, fittings and vents are avoided, and the whole elevation is rinsed top-down so nothing dries with soap in it. Spotting on the glass afterwards is not the weather; it is somebody who rinsed in the sun.
Tell us about the surfaces. Somebody will come and look at them.
The chat takes the surfaces and the address, then hands it to the desk. It books quotes — it never prices a job in a chat window.