MuswellMetro
Queen Bee
Absolutely nothing at all.
You can do it in one pot with water too, although a bain-marie is better.
Once the wax has melted, let it cool and remove the "disk", scrape the crud off the bottom and repeat.
Where are you in Suffolk ?
if you are in a hardwater areea it needs to be rainwater, otherwise the alkali water soaps the bees wax
alternative is to add lemon juice to acidfy the hardwater