side sliding windows not opening

[hellrider]

Hi guys, got an issue with my windows on the side of the T6. The front are fine, but the rears are flush fit sliding openers. Problem is, they've not been opened for probably a couple of years and they're now stuck shut. Does anyone have any remedies for getting them open again? Tried the old washing up liquid and credit card round the seal to no avail on the outside. Doesn't seem like i'm able to get anywhere near the seal from the inside. When you pull the 'butterflies' plastic wing typle things that then enable you to slide them open, there is zero moverment. Silicone spray/WD40 around the seal? cheers in anticipation

 

[Pete the meat]

I'm having the same problem, only the butter flys are opening and the pins are sliding up and down. There is a bit of water ingress, I'm hoping that the sliding mechanism hasn't rusted and corroded to a point of no repair.
I have the roller sun visor and there is rust marks on it when I roll it out. Further investigation needed with more trims to be taken off and snapped no doubt.