Wd40 on a carbon frame is a he'll no you are just making no sense , I use white oils to clean the chain not the frame .
The fool proof way to clean a carbon frame is................ coconut oil , yep or she a butter , or coco butter , I swear I'm not trolling .
Next time you clean don't even use water or alcohol just warm up some coconut oil in a tin over the stove and use a clean rag to apply it and one to rub it all in and watch all the grease lift off like the Apollo space mission. 🛰🛫