My RM-F04 remote hardly works anymore, especially the OK button. Looking at the Forum the general advice is to prise none-working remote controls apart and clean the rubber keypad and circuit board with isopropyl alcohol. I managed to pull the remote apart but there is a fairly thick film of oil at the back of the keypad and on the circuit board. None of the other posts mention any oil, so I am not sure whether I should clean this off, or treat in in some other way? Any advice you may be able to offer would be appreciated.

Thanks in advance.