Just use a bottle of Teflon spray (don't spray onto tyres etc though...).
Spray generously then work it back and forwards. Do it again and again until it's free moving.
Riding around in winter will do this; just needs a bit of regular maintenance.
I've got GT85. Same stuff?
It's got PTFE in so should do the same job just fine.
@PhilDAS started
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Just use a bottle of Teflon spray (don't spray onto tyres etc though...).
Spray generously then work it back and forwards. Do it again and again until it's free moving.
Riding around in winter will do this; just needs a bit of regular maintenance.