There is a "cat spray" smell in my house only at night. The smell will begin a few hours after dusk and by daybreak the smell is gone.
This smell is mainly in the den, which is a converted carport. The adjoining living room also suffers this same smell. The bedrooms on either side of living room do not smell at all. The conversion was done sometime in the 80's. I have lived here for 7 years and for the first two years we did not notice this smell.
Please help! This is driving me crazy!