Depending on the material the hanging table for the balcony is made of, different care is required. If you are thinking about buying a wooden balcony table, remember that it requires special care. Ideally, you should treat the wood regularly, about once a year, with oil or a glaze. This protects the table from moisture, UV radiation and scratches. It also preserves the colour of the wood.
An alternative is a balcony table made of metal. However, if it is uncoated, rust can easily form on the tabletop. But even if the hanging table is coated, it is possible that rust will form on small damages. The screws that attach the bracket to the balcony railing are also susceptible to rust. So you should always keep the balcony table dry, take it down when it rains and store it in a dry place.
Hanging tables made of metal, plastic and glass are easy to clean with all-purpose cleaner. For wood, you can use a damp cloth for cleaning. You should also oil the hinges of your balcony table from time to time to avoid unpleasant squeaking.