The parquet has black stains from cleaning water - What to do?

So I would definitely commission an independent damage expert to prepare a damage report before any further treatment.

So before any further treatment, I would definitely commission an independent damage expert to prepare a damage report.

Why is that? To sue the wife? The soda has made the windshield washer fluid more alkaline, and the oak was practically liquid-smoked.

Why is that? To sue the wife? The soda made the windshield washer fluid more alkaline and the oak was practically smoked in liquid form.

He mocks my advice to have a professional fix it... you can see it however you want, I wouldn’t risk sanding it yourself if you’ve never done it before... you can definitely make it much worse.

There are cleaning agents that remove water stains from wood. The black comes from the oxidation of metal traces in the wood. It goes away again. Then oil the spot again if the parquet is oiled.

We also have 2 small black spots probably caused by a rusty clothes drying rack. But I haven't found any product yet that removes such oxidation stains. Do you have a tip? Thanks

I use the "Woca Fleckenentferner-Spray" or "Wood Stain Remover". So, it's the same, sometimes it's only labeled in English, sometimes in German. The stuff costs about 15-20 euros in a small spray bottle. But it really works well. Otherwise, you can also try searching for "Hausmittel Oxidationsflecken Holz". There is something for that too. It didn't work that well for me back then. I don't even remember exactly what it was. Good luck!

First of all, regarding the "advice" to have the parquet inspected by an expert: Experts do not work and live on "air and love". Especially in old age, aspect No. 2 applies twice (joke). Seriously, the costs incurred for an inspection will clearly exceed the benefit. Therefore: drop the idea of the expert. The hourly rate currently ranges from €90.007h to €125.00/hour. Plus travel expenses, of course. The cheaper and at the same time more effective solution is to get some fine sandpaper at the hardware store and carefully sand the surface of the affected parquet blocks. This will certainly remove the unwanted appearance, even if the upper wood fibers were "smoked" by alkali. A can of clear varnish should also be taken along when visiting the hardware store. The unaffected parquet is covered and protected with paper or cardboard, the dust-free surface was freed from dust after sanding with a damp sponge. After the spot dries, the wood fibers raised by moisture contact are briefly sanded again. Then spray the 2 or 3 parquet blocks thinly several times in only short (!) spray bursts. Better to do it several times, but always apply very little varnish and let it dry afterward. Motto: VIEL hilft nicht viel, sondern schadet ganz sicher eher dem Ergebnis. -------------------------- Good luck: KlaRa