I use Hopes or Parker & Bailey Lemon Oil. It's mineral oil (baby oil) with a lemon scent. Those two brands are labeled "non toxic & non flammable". I stay away from the brands that are toxic and flammable. The stuff you buy in the supermarket, like Old English or Formby's, is both toxic and flammable. You have to search for the good stuff. I buy Hopes or Parker & Bailey at McGuckin Hardware in Boulder. We use it for our furniture too.
As I said, it's baby oil (mineral oil) with lemon added. The lemon or citrus additive seems to pull the dirt out of the wood better than straight up mineral oil.