I recently recovered a Roland System-103 Mixer from the dank basement of a neighbor.  This is a very special, very rare part of a Roland synth setup, and I was very excited.  However, at ~45 years old, most of it spent in a basement with a leaky window in the Northeast, the faders barely moved.  I looked at replacing them - not hard on old through-hole stuff like this, but I was a little concerned about finding the right part.  On a friend's recommendation I bought a can of this and put the TINIEST amount into the fader, moving it around.  The faders became fresh and movable, almost immediately! Some dead zones which had caused weird panning, and all the scratching, were instantly gone.  So - this stuff is fairly expensive for a can, but considering the amount of work it just prevented, this is a miraculous product.