How to dissolve beeswax on the underside of a porous wood structure
Esters are good for dissolving wax, but use a long carbon chain that is not flammable.
Isopropyl myristate is sold online to people that want to make their own cosmetics. It is relatively cheap. It will leave an oil film that can be removed with liquid detergent in warm water. 

For thick wax, warm with a blow dryer and scrape with a plastic spatula. Then try above.