I have glass blocks in my spa where water pours into my pool. I have clouding on the outside. How do I clean?

I don't want to adversely effect my pool water by using a wrong chemical. I just want to clean the outside of the glass to rid it of the white smokey haze. I believe the cause is splash from the waterfall over the glass from my spa to my pool. The white haze will not rub off. It currently covers only portions of the glass, but I believe it will eventually cover all the glass, dulling the look of the spa, especially at night when I turn on the spa light. I need ideas to erase or remove the offending build up on the glass.

Answers:
it is hard water calcium build-up. I have the same problem on the tiles of my outdoor spa where the waterfall flows past..

You can go to a pool store and get a cleaner.

Other answers:
maybe vinigar?
maybe vinigar?
Glass cleaner with ammonia or vinegar.
go to the pool chemical store, tell the salesperson about the products you use and he can recommend something that will not harm you or your water. hope this helped.
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