Here’s my secret (from when I had animals)
1 - NO INDOOR LITTER BOXES - my cats went outdoors during the day and in at night. No litter boxes. If I need a litter box, the cat has to go. Period.
2 - Clean animals. Baths with a bit of mild detergent soap and rinsed really well with nothing left on the animal. Needless to say, no perfumes or smelly rinses. Baths are immediate before coming into the house, if they, say swam in some funky pond or something. Healthy animals, clean animals. Also, I choose animals with little shedding. Makes a diff.
3 - washable surfaces- dog beds are a blanket or old quilt that can be washed. Bleach is your friend. Floors washed with Clorox clean up, excep for wood - wood is washed with a mixture of Lemon Mr. Clean and Murphy’s oil soap. Wash all walls and door jams, wash all kitchen cabinets and move the dang refrige. That mixture is heaven scent. Heh. Really, its the cleaning that makes the diff. All dirty nose marks on windows, it just has to go. When the house is clean, it smells great.
4 - part of above, but has to be said - no carpeting. Even without animals I only have wood floors and area rugs; there is no way to keep a wall to wall carpet clean. The backing rots and the dust is unbearable, besides the smell.
5 - vacume. Invest in a really good one, and use it, all the time. Getting that hair and dust out of the air and out of the house is paramount to cleaning. I don’t even have a broom or dust pan, except for use of something like broken glass or spilled pasta or something. Then the vacume comes out, after, anyway. Brooms just don’t cut it, and push the dust around. And vacume from the top, up high, to the ground last.
6 - Animals just aren’t allowed on the furniture. Yes, it happens, especially when I’m not home, but in general they aren’t and it keeps the furniture alot better. Sometimes the dog is penned in the kitchen when not home; often the dog stays outside. Cats are outside all day anyway, in and sleeping on the beds at night, yes, but see 7
7 - laundry - all the time. Constant. Bleach. Most things I buy are white so I can bleach them clean. Any coverings will be laundered and bleached often.
Sounds like a lot of work, but animals are. It is a constant rotation of cleaning. If i don’t, the house begins to smell.
The above attention is the only way I know of to have animals and a smell free house. If a house I encounter has smells, I can find one (or more) of the above issues neglected as the reason why. Just the way it is, in my opinion.