On Wed, 27 May 2015 02:01:46 -0700, fred wrote:

Are they aluminium caps? If so, this is a common problem and nothing to
do with their being glued on:

http://yourcarsite.co.uk/remove-stuck-tyre-valve-caps/

If that doesn't work, you will need new tubes and plastic dust caps.

Many thanks Now that's a useful helpful link.

So ARE they metal caps and/or valves? If so, then how long since they
were last removed?