Mercury your advice re the Dischem alcohol worked just fine , all traces of sticky rubber coating has been removed without damaging the markings , but you were right , it does require quite a bit of finicky work.
Sawbones , your alternative re the cornflower has been filed for possible future use.
Thanks again to all for helping me out.
I never got around to getting my Ham license , but at one time I was able to send and receive CW (Morse Code) at a slow pace ,perhaps I should have another go.
What is that Afrikaans saying--"van uitstel kom afstel".
- - - Updated - - -