Water dripped from the zinc vase onto the parquet floor

Liability insurance does not pay in cases of favor services.

That is not correct. On the one hand, they have to pay (BGH IV ZR 467/15 from 26.04.16), on the other hand, at least some liability insurances have now included that explicitly so that you have security and do not have to sue in case of an incident.

That is not correct. On the one hand, they have to pay (BGH IV ZR 467/15 from 26.04.16), on the other hand, at least some liability insurances have now included this explicitly so that you have security and do not have to sue in the event of an incident.

Correct, you have to search for a long time to find a personal liability insurance that does not cover acts of kindness. Mostly capped with an upper limit, but hardly below 10k...

If a few weeks have already passed, what makes you so sure that you did not (partly) cause the damage yourselves? You surely watered the plant in this pot as well. Both before and after the vacation. At least that is how I would argue as an insurance company.

Earth to , where are the (informative) feedbacks?

Admittedly, I only just read "zinc vase" in the title. In the text, the vase then becomes the pot.
And have you ever seen balcony parapets clad with zinc sheet metal? You almost always have black streaks from the zinc/rain, but not within 2…3 weeks…
That has definitely been rotting there for quite some time.

As far as plants and the surroundings are concerned, unfortunately I am not well informed. Therefore I probably confuse the terms. However, it is a plant pot (according to my wife) made of zinc. It definitely was not like this before, as we have had the pot for years and are aware of the leak. It has been placed in many corners and is regularly moved, as we always rearrange it during visits (to expand the area at the dining table). The plant also requires very little water. If there is too much, the water runs through the soil at the bottom and flows from the saucer into the pot. I ordered the product from Woca. It is supposed to arrive midweek. Then I will gladly report.

Get some soda powder. It is available in a Russian discount chain in Germany, which can be found in every larger city. It costs 1 - 2 euros per packet. This is basically a bit of caustic soda. This dissolves the zinc rust on your parquet in place and off. But you have to test it carefully. Then you have to see if it comes off. If not completely, sand it a bit more and reseal. But I think it will come off well with soda.