Want to use old LR for new tank

[O-Pee-Chee]

So in May of 2012, we moved and I took down my SW tank. Since then, the rock has been sitting in a couple of 5G buckets outside with a lid on it. No idea of the condition but I imagine it's not pretty.

Fast forward nearly 18 months later and I'm starting my SW tank again from scratch and curious what I should do with the rock. I'd like to use it but what should I do with it before putting it in the tank to start the cycling process? Should I just scrub and rinse it and drop it in or?

Thanks!