It probably depends a bit on where in the country you live. In Skåne and the east coast (e.g. Trosa), the water is often lime-rich, and what I've seen is that dark sinks always appear unclean with spots from the water. In Gothenburg, there's less lime in the water, and the sinks don't get spotted as quickly. The same probably applies to floors.
Do a test, ask to get a sample tile and splash it with water daily, allowing it to air dry. After a few days/weeks, you should see results, although on a small scale, but still something.
/ama