You can make an effective beetle spray depending on which essential oil you prefer.
Carpet beetle treatment borax.
Boric acid borax and other boron containing salts are part of the borate family of chemicals.
You can not take boric acid as a harmful chemical instead it is a natural remedy to kill carpet beetles.
Boric acid which acts as a poison on insect metabolism is only hazardous to humans if ingested or inhaled in large quantities.
While carpet beetles are difficult to get rid of completely you can keep them under.
These cousins of the varied carpet beetle are slightly larger in size at around 0 3 0 5cm and have a more rounded shell their shells are light brown speckled with black and white markings.
Boric acid has been shown effective against some wood pests such as carpenter ants termites.
As you mentioned borax is a widely used and apparently effective treatment and deterrent for carpet beetles.
Boric acid or borax is a recommended treatment as it kills almost any insect while being completely harmless to humans.
Other essential oils that might seem useful are clove oil and peppermint oil as these act as natural insecticides.
Before using the boric acid for carpet beetles you should clean the fabrics to remove any potential beetles.
Use the insecticide on any potential points of entry such as windows doorways vents or utility pipes.
They had to get pest control in to get rid of them.
As boric acid can cause bleaching you have to be careful that you don t bleach your fabrics.
It is required by the government to follow product label instructions.
In the event of a severe carpet beetle infestation there are several effective treatments.
Carpet beetle spray made of essential oils a mixture of cedar and neem oil works well in eliminating carpet beetles from your house.
Apply an outdoor insecticide for carpet beetles around the perimeter of your house.
Boric acid and other residuals might be applied to cracks and crevices.
Spread boric acid on the fabric this will kill the living larvae and eliminate the chance of new infestation.
I don t know if borax works but there was a recent eposide of how clean is your house where this house was infested with carpet beetles and flesh eating beetles.
Vacuuming before treatment may remove potential carpet beetle food sources.
Remove and destroy any bird or insect nests from around your house.