Lighter fuel is basically very clean petrol, also known up here in ‘straya as Shellite which is available from the local hardware store for a much lower cost than lighter fuel. Another alternative for instrument cleaning is Iso Propyl Alcohol (IPA).
Try and get some instructions from somewhere before bogging in and dismantling ANY sort of instrument, please don’t ask me how I know!!
Best of luck.
cheers
Bill Pudney
in sunny Adelaide