Demagnetize CDs

I was under the impression that you should demagnetize periodically or even before every critical listening session… so after and then after again and again. 

How do you demagnetize something that's not magnetic?

thecarpathian,

"How do you demagnetize something that's not magnetic?"

 Thank you. 

A cursory internet search on the subject yields opinions from people who claim that, even though aluminum is virtually non magnetic, when exposed to the inner workings of a CD player, CDs do develop a magnetic field.

I will (probably) say no more.

Yes, the aluminum can become weakly magnetic in the presence of an external magnetic field. But once it’s no longer influenced by that field, it no longer is. It cannot, on its own, hold a magnetic charge as it has an eneven amount of electrons. So the only way to demagnetize your CD is to do it while it is being subjected to whatever magnetic field or electromagnetic field within the guts of your player or transport. Hmm...Sounds like a tweak waiting for an inventor!