We have a moss rock waterfall and edging around the backside of our pool. We are in the midst of having travertine put down for decking and coping. Now that the pool is drained and new travertine is down the calcium buildup on the moss rock at the waterline looks horrible. We’ve tried scrubbing it, power washing etc and nothing is working. Our pool guy told us that doing the bead washing won’t help because it’s probably through the stone now. Any suggestions?