Cleaning/maintaining oak parquet

Hello,
we will be moving out of our rental apartment soon. The floor is made of oak parquet. Over time, it has unfortunately become unavoidable that water stains appeared on the floor (see picture). Does anyone have an idea how to remove them? We have already tried parquet soap, but without success.

Thank you very much in advance for the answers.

@dergiss: Please excuse my directness, but on the one hand, I believe that water stains can definitely be avoided, and on the other hand, you will need to talk to the landlord about what to do.

I consider sanding down and resealing essential here; in my opinion, anything else is pointless.

@dergiss:
Please excuse my directness, but on the one hand, I believe that water stains can indeed be avoided, and on the other hand, you will need to speak with the landlord about what to do.

I consider sanding and resealing indispensable here; everything else, in my opinion, is pointless.

Thank you very much for the response.

Directness is no problem, so you can also directly explain to me how I could have avoided the water stains in the situation where they occurred.
I look forward to your explanation.

Water stains occur when moisture is not absorbed immediately or from plant pots that stand directly on the floor.

Over-wetting while cleaning is also a cause that must be avoided.

Vacuuming or dry wiping is usually sufficient. If it becomes necessary to refresh the floor, suitable cleaning agents should be used. It is essential to distinguish between oiled, waxed, and lacquered surfaces.

However, for all surfaces, do not use microfiber cloths (abrasive effect).

Also always clean with two buckets. One with cleaning agent (observe the manufacturer’s recommended concentration), the second bucket with clean water.

Do not misunderstand, I in no way imply that I have acted incorrectly. I do not wish to lecture.

These are simply tips intended to help you enjoy wooden floors for many years.

@dergiss:
Please excuse my directness, but on the one hand, I believe that water stains can definitely be avoided, and on the other hand, you will have to talk to the landlord about what to do.

I consider sanding down and resealing indispensable here; everything else, in my opinion, is pointless.

Hello!
I would agree with the first paragraph – but not the second. Sanding down is done for large-scale damage and/or intensive use over many years. And it’s not exactly cheap – especially if the landlord then claims a loss in value.
A surface treatment, e.g. with oil or a glaze, might be sufficient. But to avoid making things worse in trying to fix them, better to call in a specialist company.
Best regards,
Tomtom.