Hey - thanks all.
I followed 2 of the below:
1) hairdryer to soften the glue. Worked lovely, decal came off in one, nice and easy..
2) wd40 the removed the remaining clunge without any effort..
Very simple when you know how
thanks again,
Paul
PS: dont have any switch cleaner. I just use air and make sure everything is covered so avoids getting dusty..