IMO....if you had live rock @ one point and just threw it outside to dry...DO NOT just power wash it. It is dead...so you don't need to cure it. What you need to do is remove all the dead garbage from the rock and a power wash will not do it. I'd strongly suggest to use acid. I've done it...others here have done it and it's a great popular method to clean dead rock. (or rock which is loaded with bad live things which you want to kill) Once the rock is clean as a baby's bottom...then reseed but only at that point.
If you wanted tips etc on the acid treatment, I'd be happy to help.
btw...welcome to the forum.
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