Odoriferous repellents, including mothballs and ammonia, are generally ineffective in expelling squirrels from buildings. Camphor is used as an alternative to mothballs. Mothballs containing naphthalene have been banned within the EU since 2008. It is also used to repel some insects, much like mothballs. Mothballs and other products containing naphthalene have been banned within the EU since 2008. Naphthalene is a major component of some mothballs. Both of these formulations have the strong, pungent, sickly-sweet odor often associated with mothballs. Exposure to naphthalene mothballs can cause acute hemolysis (anemia) in people with glucose-6-phosphate dehydrogenase deficiency. In China, the use of naphthalene in mothballs is forbidden. In enclosed spaces, mothballs can be placed as a repellent. Although occasionally used as snake repellent, mothballs are not effective for this purpose. In one study, mothballs (which contain napthalene) were placed in a flowerbed. European starlings also performed a similar behaviour with mothballs. Following 20 years in mothballs, she was sold for scrap in March 1992. It is best known as the main ingredient of traditional mothballs.