How can I clean grout in the pool?


Hey everyone, well I'm new to this pool thing, I pretty much am learning how to clean and maintain on my own, since my pool guy quit on me. But anywho, I have been doing a pretty good job with the exception of the grout and tile. It's just dirty, nasty dirty amd the tile has alot of white buildup and I dont know how to clean it or what to use. I tried the pumice stone and I didnt see any results. If anything I think I scratched the tile. Can I PLEASE get some advice.???

q clean grout in pool
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