pool waterfall rocks turned white

We have a waterfall running into the pool and the rocks have all turned white. What's a good way to clean this?
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Adam Russell wrote:

Don't believe you will be able to clean, the rocks turn color because of the chemicals in the pool. If you are able to clean, it will only return. You might think about coating the rocks with a urethane or some kind of protective coating, but this may make the rocks look unrealistic Good luck
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Unlike a perfectly clear blue body of water in the middle of a sod lawn with a 36" coping of red and brown paver cobblestones, and a waterfall from nowhere, which looks perfectly natural...
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