One more for the shopping list: Orange Power, or any of those citrus-based orange type things. That stuff eats through anything, I’ve used it for stickers before, and it’s as good as nail polish remover but without the acetone. Smells better too.
Make sure you have plenty of old rags around as the wd40 helps move the old sticky residue off the frame but onto clothes, hands etc etc. Plan to toss the rags unless you want to transfer the the old glue and sticky residue elsewhere.
Afterwards, you wash/clean the area to remove any trace of the wd40. Not that it’s harmful but it remains slippery. I’ve used WD40 and plenty of old frames where the decals have split and cracked and armed with a plastic spatula it has worked perfectly to remove them all.
Tea tree oil has to do it. peel the stickers off as best you can, don;t worry about the gunk left ver, then use heaps of tea tree oil and some elbow grease.
Goof Off (sold at bunnings) is the best I have found. Then use Acetone to remove any residue left over as it evaporates of and leaves a clean finish. Acetone wont react with the resin. I have used it on my carbon rims heaps.