Hi, thanks for all your posts. I have used White spirits and a rail rubber. The rail rubber (bought from a local hobby store really took away the dark marks on the silver electric rails. However?l, the White spirit didn't seem to be so effective (White spirit is like an alcohol based paint thinner/brush cleaner).
I will continue with this and inassume you all agree to using this on the actual motors and not the rail rubber? Really appreciate everyone's help as I really want to get my 12v running again!!!
Just out of interest on breaking open the motor, are you able to replace any of the parts? Did Lego originally sell any spare motor parts for the proper 12v motors?
Thanks for your help. Just on this, as you've been recommended as per below, are you still able to get your 12v running smoothly. I have been mucking around and buying essentially all the 12v I wanted and then, becuasebif my concerns that the motors might pack in or be jumping, I bought a stack of 9v track and a few motors. I've also dabbled with the PF motor becuase I wanted the Cargo train. Ultimately, I want to stick with 12v because of the remote points/signals etc, but, I need to make a decision and go with one. You can pick up 9v motors for about £15 used whereas 12v are more like £40 or often higher.
It's just perfect when you get smooth running trains like with 9v but I'm torn with my old 12v.
Thoughts?