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 and the tile has a lot of white buildup and I don't know how to clean it or what to use. I tried the pumice stone and I didn't see any results. If anything I think I scratched the tile. Can I PLEASE get some advice.??? And if anyone has some tips on how to vacuum a pool manually, I would appreciate hearing them, Thanks!

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