How to effectively clean a house that had cats?

To effectively clean a house that had cats, start by vacuuming and dusting all surfaces to remove cat hair and dander. Use a pet-safe cleaner to wipe down surfaces and wash any bedding or fabrics that may have cat odors. Consider using an air purifier to help remove lingering pet smells. Regular cleaning and maintenance will help keep your house fresh and free of cat-related odors.