How can I safely clean wood?

A safe recipe for cleaning wood is as follows:

1/4 cup white distilled vinegar
1/4 cup water
1/2 teaspoon liquid soap or detergent
A few drops jojoba or olive oil
3 to 5 drops fragrant essential oil (optional)

Combine the ingredients in a bowl, saturate a sponge with the mixture, and squeeze out the excess and wash surfaces. The smell of vinegar will dissipate in a few hours.

Makes 1/2 cup
Preparation time: less than 1 minute
Shelf Life: Indefinite
Storage: Glass jar with a screw top

Variations:
Lemon Lightener: Lemon is mild bleach and can be substituted for vinegar to lighten wood. Only make as much as you need at a time.

Antibacterial Red Thyme Wood Cleanser: Add 5 to 10 drops red thyme essential oil. Red thyme adds an earthy scent and provides antibacterial qualities in addition to the ones naturally found in vinegar. (Oregano oil and rosewood oil are also effective).