This appears to be the best way to remove wax. Thank you!!
I have tried to remove the wax with ethanol earlier today, but to no avail. The wax gets diluted, but by rubbing it with cloth the dilution is distributed on the pot again.
Now this patient procedure of simmering the pot seems to work best of all ways I have tried to remove the old wax layer.
Thank you for the tip of not covering the pot and lid with cloth whilst simmering for an hour!
Since the molten wax can come to the surface of the water freely, the wax forms a layer on top of the water.
The first batch produced a slightly foaming layer. After an hour, I ad boiling water to the big boiling pot, so the layer can flow out of the boiling vessel. After that, I use a hook to take out the tea pot, which I rince with boiling hot water.
The same is applied to the lid of the tea pot.
The pot was much cleaner after drying. Some traces of wax remained.
The second run produced only an oily layer on the water, no more foam. I proceeded like the first time. The result is very promissing: only slight remains of wax in some crevisses (like the stamp underneath the tea pot).
The third boiling looked like this: After three simmering essions and hot rinsing the result looks quite nice.
And I will start seasoning the pot once the result satisfies me.