old hardwood flooring under subfloor

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I just bought an older house and removed the carpet and subfloor to get to the hardwood floors. I did that water test and the water doesn't soak in to the wood, it just beads up on top. Do I need to sand the floors or can I just clean and stain them?? They don't have a stain on them currently. If I don't need to sand them, what can I clean them with that will get all the old dirt off?

Thanks.