I've been using a 50/50 mix of pink antifreeze for over a year now. No worries about mould or having to clean it out. As a bonus it lubricates the pump and keeps all the seals in good condition, just like it would on a cars system.

Thanks for the info, I've now removed it....

Yes you can use some hot air and aim for about 60ºC or as hot as your hands can stand.

Use a thin blade to peel it off and try not to touch the sticky side..

I've had this problem before and it turned out the phone was blocked by the network. Try using checkmend.com . If its not blocked then its going to be a hardware/firmware issue

new keys are easy to find online, and you'll need to use a fine tip soldering iron to put the new one on