Hmmm, never heard of it but it's an interesting idea. The only thing you should think about is whether or not a week is truly necessary because vinegar and water is essentially just a very dilute weak acid. The acid will react with the calcium carbonate in your rocks and begin to dissolve the top layers of them, but you'll have far more rock than you'll have acid, so I bet long before a week is up your rock is just going to sitting in a water and acetate bath not really doing anything.
If you want to use an acid you could try using muriatic acid. There's quite a few how-tos online and it's much, much faster and I think quite a bit more effective. It's also super easy to neutralize when it's all said and done. You'll just need to do it outside and be extra careful.
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