Detergent is read as the wish to be clean and fresh again, often after something felt like a stain on your reputation. Dream books link it to renewal and presenting yourself anew.
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.