Here are some tips for dealing with dusty furniture:

1. Dust regularly: Dust your furniture at least once a week to prevent dust buildup. Use a soft, dry cloth or a feather duster to gently wipe away any dust.
2. Vacuum upholstery: Use a vacuum cleaner with a soft brush attachment to remove dust and dirt from upholstered furniture.
3. Use microfiber cloths: Microfiber cloths are great for dusting as they trap dust and dirt instead of spreading it around. Avoid using feather dusters as they can spread dust particles into the air.
4. Keep windows and doors closed: Keep windows and doors closed when dust levels are high outside, such as during windy days or when construction is taking place nearby.
5. Use a HEPA air filter: A HEPA air filter can help remove dust particles from the air, which can prevent dust buildup on furniture.
6. Clean spills immediately: Clean up any spills on furniture immediately to prevent stains and dirt buildup.
7. Avoid harsh cleaning products: Harsh cleaning products can damage furniture and strip away finishes. Use gentle, non-abrasive cleaners instead.
8. Rotate cushions: Rotate the cushions on your sofa and chairs regularly to prevent uneven wear and tear and to keep dust from settling in one spot.
9. Use furniture covers: Cover your furniture with slipcovers or dust covers to protect it from dust and dirt when not in use.
10. Don’t forget the tops and undersides: Don’t forget to dust the tops of furniture pieces, as well as the undersides and backs, where dust can accumulate unnoticed.

If your furniture is very dirty or has deep stains, it may be best to hire a professional cleaning service to handle the job.