Probably not over a radiator - cool and airy is best, so perhaps near a window which is opened regularly. A draugty barn is sometimes recommended, but never on the floor, especially concrete which seems to attract damp to the fleeces.
I've been remiss with my fleeces for the past couple of years, so I'm dreading when I do get round to sorting them, wondering just what I'll find.
There is an easy option - chemicals, but I find them dangerous, smelly and not really in keeping with the eco aspects of using your own sheep's fleeces for crafts.
My mother used to use moth balls, I think they are napthalene or something and stink to high heaven - how to stand out in a crowd
From wiki:
<< Naphthalene is a major component of some mothballs. It repels moths as well as some animals.[citation needed]
Since mothballs that contain naphthalene are considered hazards, safer alternatives have been developed, such as the use of 1,4-dichlorobenzene, however, 1,4-dichlorobenzene has been declared as a potential neurotoxin. 1,4-dichlorobenzene has been linked to potentially causing depression as a form of encephalopathy.[3] This complication resulted with an increased use of Camphor as a moth repellent. Camphor is frequently used in place of naphthalene in Asia.>>
<< Unlike naphthalene and dichlorobenzene, camphor has medicinal applications and is not regarded as a carcinogen, though it is toxic in large doses. Red cedar wood and oil is also used as an alternative moth repellent. Pheromone traps are also an effective tool used when attempting to protect valuable clothing.>>