When I've done this, I gradually work the old clamps off with a bradawl rather than sawing. If the resin is set very hard, this may take a while over a number of clamps - possibly do it over several sittings if difficult. I'm not saying that my way is better but it preserves pole length (rather than losing 1"+ per section). Then I just do a quick rub down around the section end and wipe with a damp cloth to remove the dust. I let it dry for a few minutes and glue new clamp on. I've found that it lasts just fine.
I do wonder if there is variation in quality with the supplied glue because I have seen others write that it sometimes doesn't last.