Furniture wax is suitable for indoor furniture maintenance. If the furniture is outside without a roof, it would be wise to maintain it once a year. I use wood oil "Teak oil", but other wood oils are also suitable. Before greasing, sand lightly with sandpaper (sharpness 120) along the tree, the easiest way is to use a porolone sander block. It is easier to grease with cloth. Apply oil as plenty as possible, but it should not be left there. An hour or two after the application the oil, which has not absorbed, must be certainly wiped off. Oil slick that has not been swept shall crepitate. When greasing wear vinyl gloves - liquid oil is harmful to the skin. Oil dries in a few hours and can be touched. It dries completely approximately in one week.