If you can access the space, get some Nature's Miracle enzyme cleaner. It's not just a cleaner but actually 'removes' the odor causing bacteria, etc. and the smells... really amazing (and no, I have no personal stake, but have found out about it on cat forums. I'll be using it when we leave our present house before showing the house.

I know what you are going through...my cat used to use my floor ducts as his personal toilet. I couldn't blame him too much, since there was a faint cat litter odor from the garage getting into the ducts. I used Nature's Miracle too-I dumped quarts of it right down the ducts. It did help.

You really need to close off the crawlspace completely though because it is the nature of a cat to keep doing annoying things like that.

Thanks for the link, Thatgirl! My daughter is raising a goat for FFA to show at the county fair this summer. It is housed at the school with numerous other goats and boy oh boy is it getting smelly!

"We had an impossible time all winter keeping our cat out of the crawl space, which he loved to use as his litter box."

We used to have a problem with stray cats going potty in our flower beds. We sprinkled black pepper in and around them. Alot cheaper to use than those expensive sprays they sell at the pet stores.

Thank you all for your suggestions! I will try them all.

Fuzzy

I also have a “senior “ HUNTING cat- who always killed mice & moles in the crawl space of our old lake house.. she refuses litter box & ALWAYS went out w/the DOGS ( thru dog door) to do her “business “ in the woods.. now that she is older: I notice a SMELL in my bas meant laundry.. checking all ways to deal w/this ISSUE!

I've heard that Simple Green and Odoban works well too. Besides pepper used as a detergent cayenne pepper sprinkled around works too.

Have you considered putting a litter box in the crawl space?