J.G.
We just put a very expensive light quartzsite in our kitchen. The spots are terrible! I had them come out and clean them up. I'm using this stuff called "high gloss" but it isn't working. To remove the water stains, they have to polish the counter with a grinder and then reseal. Once the spots are there, they are there unless you grind them off. :-(
I don't think there is much we can do. In the future, I will NOT be buying granite or quartzsite. It's terrible! It looks nice, but i find the upkeep to be terrible. And I wipe it off all day long. What a waste of energy.
Sorry, I wish I had a solution. I think the trend towards light marble looking stuff is a ploy to make money because it will all need to be replaced within a few years! next time I'm buying man made. My counter looks terrific, just don't look too close :-(