Honestly, full eradication sometimes needs a pro. Licensed technicians can treat key spots with targeted insecticides or fumigate textiles, especially stuffed furniture and untreated rugs.
I dry-clean or wash new and stored fabric items, then wrap them in tight-seal plastic. Preventative quarantine hides are a good shield.
Repair screens and seal gaps near windows and doors; adult beetles often hitchhike in through cracked areas or potted plant carriers.
For delicate items you can’t launder, freezer treatment works miracles, freeze them for a few days to kill larvae or eggs without damage.
Vacuum under baseboards and carpet edges. Carpet beetle larvae love pet hair and fiber debris, the places we often vacuum least.
Layered strategy wins—vacuum, launder, freeze or steam, use DE or essential oils, store in airtight bins, seal entry points, and get a pro if it persists. That’s the only way I’ve kept them at bay long-term.