I’m renovating a house what do I do to this?

this was under a carpet the previous owners left there was dog poop cigarettes trash etc all around this area I’m assuming this is from dog and cat urine. I plan on pulling up this just don’t know how and what exactly to do to make this sterile. I just put a bleach cleaner on it and letting the room air out as of... show more this was under a carpet the previous owners left there was dog poop cigarettes trash etc all around this area I’m assuming this is from dog and cat urine. I plan on pulling up this just don’t know how and what exactly to do to make this sterile. I just put a bleach cleaner on it and letting the room air out as of right now what’s the next step?
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