Before you start, have a close look at the channel the trim sits in, in particular if there is any bonding sealant from the windscreen stopping the rubber surround seating correctly, if there is, carefully trim it with something sharp, any excess sealant will stop it seating.
Then follow your guide of choice with the lube of choice, washing up liquid does the job nicely.
If there is any bonding sealant bulging out it will make it a pain in the arse to fit it.
Then follow your guide of choice with the lube of choice, washing up liquid does the job nicely.
If there is any bonding sealant bulging out it will make it a pain in the arse to fit it.