I think that is the same material as in the other cars where I have
used Armour All. The material looks like rubber coated in velor /
suede. I have the same material on my E91 3 series.
You're basically looking for something to lubricate the guides which is
not oil based as this might perish the rubber. I learned the Armour
All trick from a Nissan main dealer about 10+ years ago.