MC Cartridge Degaussing Demagnetizing

An old topic that I would like to re-visit and would appreciate Jonathan Carr weighing in on.

What does LYRA use and/or recommend to degauss their (MC) cartridges?

What happened to the Audio Physic demagnetizer?
Immedia seems to have dropped them.

Since many companies/manufacturers of phono carts will NOT discuss degaussing their carts and/or the material of the armature is it OK to use the Cardas or Analogue Productions LPs instead?

How EXACTLY do these sweep records degauss a cartridge?

Is it OK to assume that IF a sweep record helps a cartridge sound better then a degausser or demagnetizer is appropriate?

Assuming no DC content and a very low level voltage and current... How EXACTLY can an AC rising and then falling signal fed into the cartridge cause the cartridge to fail prematurely?

Thanks! :^)
Tom M.