Hi,Stinkypete,
I would go for the second one , (the cleaner and lubricant) , it says on the can, safe for most plastics.
(Not the circuit board cleaner)
Try some on a non critical surface first.
Also , under the front upper faring just behind and adjacent (beside) to the headlight (I think it is on the RHSide, ) there is a large yellow connector in which there are multiple earthing wires jointed. A bad earthing connection there would have strange and varied effects on the electrical operations and integrity of any associated circuits.
Happy hunting,
Cheers Winston66