Decade old cat urine smell in basement...?

To remove the smell of urine from just about anything, first clean it with some sort of soap or kitchen cleaner. Then clean it with lemon juice. If you don’t like the smell of lemon juice follow it up with a little bit of vanilla extract. One of the most effective formulas I’ve found for removing ANY odor was from Popular Science Magazine. Mix 1 quart of Hydrogen Peroxide, with 1/4 cup of Baking Soda, and one tablespoon of liquid dishwashing soap. Saturate the affected area, rinse thoroughly with clean water, and the smell is gone. This is non-toxic and safe for your animals and children, and those with allergies. This is especially helpful for removing skunk odor from your outdoor animals. As always, test a small portion of fabric for color fastness, before treating a large area. What Won’t Work... There are many home remedies for treating pet stains and odors, and let me stress that most of them are not too bad as far as removing odors for humans’ noses. Vinegar, ammonia, baking ...  more