Where is that Mr. Propper who knows how to knock on what to knock on and with what force so that the house itself washed and cleaned as when you bought it. Ahaha, it's great to have an entire post devoted to such a topic. I too have been cleaning a new penthouse and I can tell you that the outside (windows and gutters) are the worst. We ordered Gutter Cleaning Nashville https://www.cleanproguttercleaning.com/gutter-cleaning-nashville/ to have the guys do the gutter cleaning, the windows were cleaned by guys from another company. If you look at the scenery from the inside, it immediately gives the impression that no one ever cleans the outside, and it's only the seventh floor. A small penthouse (for me it is always the last floor) turned into a loft with dirty windows.