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How to clean a concrete hearth?

We're moving into a place with a non-functional fireplace and a stained hearth. I haven't touched it yet and have no idea what the stains are.  A guess for the circular ones is wine or some other dark drink.  Any ideas for a relatively non-toxic clean up?

It turns out a lot of it is wax.

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petercd9 months ago

From mild to wild, bleach, trisodium phosphate and muriatic acid.

Steps and preps here http://homeguides.sfgate.com/clean-cement-fireplace-hearth-93418.html

I would start the mild at baking soda, Scotch-Brite Non-Scratch Scrub Sponges, and elbow grease...and possibly vinegar. No matter what, wear gloves.

rickharris9 months ago

http://www.concretenetwork.com/concrete/cleaning_c...

i would go with the bleach for the wine/beer stain as well.

As always try on a small patch first.