Almost all essential oils are solvents by nature. That's where turpentine originally came from. Orange oil is one of the best paint/glue strippers around. There's a strange trend lately where some distributors of the oils are advising eating undiluted oils and direct topical application, both of which are a bad idea.
Tru-oil is oil based, so any non-polar solvent or even oil should dissolve it. A little WD40 followed by soapy water does the trick. Some of those essential oils can be pretty pricey, too much to use as hand cleaner anyway. .