Laundry on a line is on show for the neighbours, which is why dream books link it to private matters becoming visible. A full clothesline is also read as freshness and a household in order.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.