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Originally Posted by Patti  You could try Nature's Miracle sold at Petsmart |
If you understand a little about the chemistry of urine and feces stains, it easier to understand why certain products work, and others don't. Urine and feces contain a protein that regular cleaning products don't get rid of, only those products with an enzyme, which is a bacteria, that eats protein work on these stains. Other types of cleaners might get rid of the mark or stain to your eyes and nose, but the dogs will still smell the protein and return to the spot. It is wired into their brain to return to the spot and this is why any scent of the odor has to be removed. Neutralizers don't work for the same reason, your nose won't smell the urine, but the dog's nose will.
Using the enzyme cleaners is a little different than using regular cleaners. You have to moisten the area with the cleaner and allow to air dry. I usually will spray the spot, place an old towel on the spot and stand on it; this absorbs most of the pee. This is the important part: Next, thoroughly saturate the spot with the enzyme cleaner, and allow to air-dry. While it's drying the enzymes eat the protein, and the protein is what causes the smell to which the dog is attracted. You can also use a small black light and see all the spots on the carpet and spray these. Pet stores sell small black lights for this purpose. You can't rush this process, some areas might be so bad they have to be resprayed because urine has soaked into the surface or padding.
Most of the time this gets out the "visual" stain, sometimes especially with an older stain, you might have to use another product. Hot Shot is my favorite.