What will take off spray paint speckles off my truck? from painting house soffets?

workers were spraying the soffets on a house we were painting & the wind must have blown the spray and went all over my truck {its all tiny speckles all over the truck] and ive tried using soap water,crud cutter which removed it but i had to scrub it & wanted to know what other method would take all these speckles off the truck eaiser and faster without harming the trucks finish[clearcoat]? would w-d 40 work