I wasn't sure if I should put this question here or on the "everything else" part of the forum so I guess I'll see what replies I get. My grouting is only a year old, and lately I've become very conscious of the grout lines but did not pay all that much attention to it since I've been battling other issues with water clarity, white water mold, etc. But upon closer inspection I see that virtually all the nice gray grouting has accumulated white deposits...REALLY tough to get off. I literally whittled down a few plastic scrapers to nothing and it didn't even budge it. It's very unsightly. Any suggestions? I don't want to use anything that will scratch the tiles, nor enjoy the thought of having to go around and scrape every single grout joint around the entire pool. Is there some sort of chemical that works well to clean grout that also would not damage the tile? Thanks for any ideas.