Hi Jim ...No I never knew that worked on plastic... Being I have new ones I will pop the old ones off.
Re the heatgun- We have a black table and from time to time it will get a milky looking stain caused buy a hot item e.g - cup of coffee- and a friend told us to just put a tea towel over it and the just make a couple of passes with a hot iron and sure enough it works. It must work on the same principal- 'Fire on Fire'Again.... Thanks for all your 'hot' tips.
Much appreciated!
Cheers!