cartridge demagnetization


Are there any telltale signs that your phono cartridge [especially MC] needs to be demagnetized, or is this just a preventative maintenance issue?
boofer
Miyajima MC transformer has buid in demag. option.
I've seen Luxman Demags on ebay very often
I use the demagnetizing cuts (side 2, tracks 2 & 3: pink noise) on Analogue Productions Ultimate Test LP. Was skeptical at first, but the results were unambiguous on my Koetsu.
I demag my cartridges. Has anyone noticed that it takes a few sides to smooth out after demagnetizing your cartridge. It always sounds a little bright to me at first, and then things settle down and sounds great.