What is the safest way to clean hardwood floors?

DO NOT USE anything with Water, Water damages wood flooring. DO NOT use steamers, they use HOT water and that damages wood flooring. you need an oil or wax based cleaner. Go to Lowes

or Home Depot & get a hardwood flooring cleaner made by one of the HARDWOOD flooring manufacturers like Bruce or Armstong,

that will be OK to use. Bona

also makes a great line of flooring products.