Spider-Man saves the day, swings around the corner, and leaves somebody else’s building covered in sticky white ropes. After years of that commute, shouldn’t Manhattan look like a forgotten attic?
There is an answer, and it is more considerate than Peter’s habit of arriving through windows: his usual webbing is temporary.

The web comes with an expiration date
Marvel’s official comics profile explains that Peter’s wrist-mounted shooters spray a fluid he invented. It becomes webbing when exposed to air. The same profile says it can hold several people for nearly two hours, after which it begins to dissolve.
That distinction matters. “Begins to dissolve” is not a promise that every last strand vanishes at exactly the two-hour mark. It does explain why the city doesn’t need a permanent department dedicated to scraping Spider-Man’s commute off the skyline.
Great for swinging. Terrible for permanent repairs.
The funny part is the trade-off. A web bridge that disappears is a thoughtful feature if you live beneath it. It is considerably less helpful if you thought Peter had just fixed your balcony for the next twenty years.
That is our practical reading of the premise, not a scene Marvel is claiming happened. The official answer here concerns the comics version’s familiar web-shooter setup, not a universal stopwatch for every film, game, special formula or alternate Spider-Man.
So the next time Peter leaves a dramatic trail between two buildings, picture the person who has to look at it from the kitchen window. At least the neighborhood’s most athletic tenant isn’t leaving permanent decorations.
Image: Original AI-generated editorial fan illustration for The Mother of All Nerds. The cleanup scene is conceptual, not an official Marvel panel or a documented comic event.