It depends on the finish. While vinegar is a popular “old-school” cleaner, the acetic acid can dull or etch certain floor finishes over time, specifically wax finishes and some older polyurethanes. If you choose to use it, the dilution must be extreme: 1/2 cup of white vinegar per gallon of warm water. Never soak the wood; use a damp (not dripping) microfiber mop to prevent water damage to the wood grain.