I know the title seems stupid, its not hard to clean it up if its recent. But, my boyfriend and I are moving into his parents basement/out of his 9x10 room because his sister is moving out, YAY more space! One of the many problems with the basement though is that his sister owned a small dog, and it peed and pooped on the basement floor for years now, and she never cleaned it up, she would let it sit there for months and months. It just got to a point of disgusting you only see on those animal horder shows. Ok, maybe not THAT bad, but you get where I'm going. I'm not sure what she had cleaned it with in the past but since this has been going on for over 3 years, even though she has tried to clean it, you can smell the stench from upstairs whenever you walk by the door. Its the worst. So I'm wondering what might be my best option in getting rid of the smell. I was thinking I'd mop/scrub with pinesol but I'm really not sure, if it would only cover up the smell or if it would really get rid of it. Maybe bleach but there are no windows down there and it really makes me wonder if that is such a good idea being trapped with it. Thanks.