Hi Andy,
I find that good old WD40 applied VERY lightly, loosens up anything that I have used it on.
If possible, I'd recommend a tin of it with a straw and trigger. This makes it easier to put it where you want it exactly.
I also have a small marker pen shaped WD40 applicator, which puts just a spot on to a surface, as long as you can get to where it needs to go.
The tin and straw type applicator I am talking about is on their front page, top right, and then again on later slides on the front page, which now includes a 'bendy hose' tin of the stuff. It looks at bit like something out of 'War of the Worlds' to me.
:
https://wd40.co.uk
And I also thought that there was only ONE type of WD40, when apparently there are now quite a few, for different jobs!:
https://wd40.co.uk/wd-40-products/
Terry S