Platinum Fletch Tite is the best long term glue that I have used on carbon or anything else.
I use a dull knife to remove old fletch.Do not use a sharp knife.It will cut into the carbon.Then I will lightly sand with a wet dry 600 paper (wet)to remove any old residue.SOS pad to clean then rinse with water.
New shafts I will just clean with SOS and rinse with water then fetch.