That'd take hours !!!
Not only that, I'd be scared of the dremel chuck touching the paint, you'll want tape and a rag.
Better still, get it polished by a pro for a carton of piss.
Heya guys, its Mrs Finny here, Ive got a great idea.
Grab the kids by the scruff of their necks, and wrap em up in a big polishing cloth, and rub them all over the bike.
Maybe next time they'll restrain from washing it at all!