Discussion about the Korg PolySix synthesizer

the last time i cleaned my key contacts i used alchohol and a q-tip, 
but the results didnt last and were inconsistant. Some notes 
were 'sluggish',almost had a delay, others had to be hit multiple 
timrs......   So I recently cleaned them again, this time using LIGHTER 
FLUID  (ronsonal)  and a q-tip. I was very careful not to get the fluid 
on the laquer of the pc-board, Interestingly, i got a black residue 
from many of the round magnets on the q-tip,(but not all) .  i NEVER 
got any signs of  residue using alchohol. Now the keys work great, all 
instant contacts, no sluggish response. Perhaps this stronger solvent 
is more effective?  seems that way to me.