Nuevo awning

I have a 2007 Nuevo with the built in awning, over the years I find the rear end always stays clipped in when winding out.
If I wind it back in & undo again it popped out ok, it went back to dealers years ago & they said it just needs grease.
My plan was to give it all a good clean & to ask what grease would be best .
Thanks

I used silicon spray on my 09 Nuevo awning ,sometimes the wee spring was detached .
Boaby

The awning on our old Symbol used to do that. I carried a flat bladed screwdriver and slid it up to release the mechanism. Not a solution I know. I tried lube but was never able to fix it.