A car wash is read as cleaning up how you present yourself and move through the world. Dream books take it as a quick refresh — clearing away the dust of a long stretch.
Has this come up in your dreams before? What was going on in your life then?
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.