Rear sliding glass panel difficult to open

The rear sliding glass panel on my AC has become quite difficult to open, especially when reaching from the driver’s seat. I’ve cleaned the window channel but am not sure what to use to make it slide open/close easier. What would be the best type of product to use in this case?

 

You can try a dry teflon spray.PB blaster makes a product. When i put my power slide window in I wanted it to be as free as possible. It does help

 

Silicone spray on a q tip. Don’t just spray it in the channel. Mine goes one handed with no resistance.

 

Yeah be careful what use use, I might try some graphene or similar dry lube, I used a dry lube spray and the wetting carrier agents caused the seals to swell and it made it impossible to open for a time.

It's much easier now but had me worried for a bit.

 

You’re only lubing the bottom of the felt channel, not the seals.