Are you being serious ?DURBANS said:
'Mud' does not form on top of frets. Are you talking about general grime building up on the fretboard perhaps ? If so you need to clean it.
As for the pimpling (as you were told on sevenstring.org) it's oxidisation which is a common occurance on Ibanez hardware.
It cannot be cleaned off, it is corrosion of sorts.
I've got two Lo-Pro 7 trems, both cosmo and both 4 years old. One is completely covered in pimpling and the other is like new.
The more you rest your hand on the bridge the more it seems to happen but i wouldn't let it affect your playing. It happens and that's it really!
