Notes
This solution may be safe for sealed wood floors and other common household surfaces (I use this on our tile) since the pH of castile soap is around 8.9 (a pH of 7 is neutral). Always spot test first (a couple of times) before applying any cleaning product to a full surface! I’ve also learned, from some major trial and error, that’s important to talk to a floor expert about the best way to clean a particular floor (what kind of ingredients/methods to avoid in particular), since there are so many different types of floor surfaces today.