Well I went with Lanotec General Purpose Lanolin Spray.
More for the longevity more than anything else. It smelt like a shearing shed so I thought it must be the good gear
I would have used silicone spray as I had that in the shed but i didn't want to have to keep doing it more than I had to.
It worked like a charm, the rattle that I swore was coming from the dash, and that had me in the foetal position because i could never find, is now gone.
I did front and back and took a whole 5 minutes.
Thanks for everyone's posts to work this one out
I owe you all a beer
Once it was gone, i discovered a rattle in the glove box. All sorted, just took the key ring off the bottle opener I keep in there