You are correct. You will not want to use any sort of solvent, acids or any abrasive materials in its daily care. This is still considered a natural stone, and will require specific care when it comes to maintaining it. Here are the manufacturer's care instructions.

With that being said, the manufacturer does use an industrial grade sealer on the sink, to provide a long lasting water proof barrier. Of which, you can reapply yourself if deemed necessary... just like a natural stone countertop or natural stone tiles, if you are familiar.

These sinks are also tested above the highest standards of design, quality, durability and safety. Bathroom sinks, often than not, are exposed to less acid and chemicals than that of a kitchen sink. Soaps, toothpaste and water are usually the common things placed in a bathroom sink. These sink will not have any issues with any of those. I hope this helped. If you have any further questions, please do not hesitate to ask.