Stylus cleaners

Magic Eraser works for me - no fluids involved.

I think it is safest to say a Cartridge left alone is a safe Cartridge.

A Cartridge put into service is exposed to a set of required procedures, that from a slight user misjudgement or user error, is quite easily incurring a damage.

A Cartridge used and in need of achieving good fettle or to be fettled with, becomes the Cartridge that is at highest risk of incurring a damage. There is no solid sound advice to be offered, but Good Luck. 

If you don't know, you don't know and the individuals not knowing is the usually a cause of the damage when being reported on.     

@lalitk very nice! Looking forward to it. 

audphile1  I used up a bottle of Last Record Preservative when I was in college in the mid 1970’s to use on my favorite records. It’s really a PITA to use properly!  BUT every one of those pressings, whether German ECM pressings or run of the mill Columbia’s, remain as pristine and noise free as they were 50 years ago.  And they don’t collect static like most all new pressings do. I’m tempted to try the Last treatment again if it wasn’t such a chore to apply. That is, if it’s still available.

@porchlight1 it is still available. I still use it but rarely. Have about 1/2 bottle left.
I think it evaporates extremely quickly if you don’t cap the bottle right away.
Also it seemed on some records the sound became warmer. Not necessarily worse but depending on a recording quality it could be too much of a good thing. 
May be it’s my head…don’t know. But to your point I have some records treated with LAST from around 20 years ago that still look and sound like new.