Tip #1: I recently had that problem with my tom cats just before I had them fixed. I used a combination of a vinegar/water mixture & an orange oil cleaner. Orange oil and vinegar neutralize odors. Then after a month of cleaning the area on a weekly basis and using the spray, I then started using Febreeze on it. MY HOUSE SMELLS GREAT!
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Tip #2: If fresh: Cool water blot. Neutralize odor with white vinegar, 1 tablespoon per 1/2 cup water.
Blot in, blot out, rinse, blot dry. If not fresh: Use a good quality All Fabric Bleach – one teaspoon to 1/2 cup of water. Scrub in, let set 10-15 minutes.
Blot, rinse, blot.
Tip #3: The company who cleans our carpets said that “white vinegar” will neutralize the odor, which it has.