Most commercially-sold natural surface-cleaners are a mixture of water, grain alcohol, and natural fragrance ingredients. This is pretty non-toxic, since you can drink grain alcohol (beer, whiskey) and pretty much get away with it. Alcohol is sometimes alternately listed as "corn-based cleaner", a sleeker way of saying "corn whiskey". Or, it may be listed as "ethanol", which is a shortened form of "ethyl alcohol" (grain alcohol).
You can make your own such cleaner by buying a bottle of cheap vodka, and adding it to water. It works well.
Last edited by David3; 03-25-2015 at 10:20 AM.